add 2001 Mars Odyssey 64538 NASA Thesaurus Definition Source Definition NASA Mars orbiter mission designed to make global observations of Mars to improve our understanding of the Martian climate and geologic history, including the search for liquid water and evidence of past life. The three primary instruments carried onboard are THEMIS (Thermal Emission Imaging System), GRS (Gamma Ray Spectrometer), and MARIE (Mars Radiation Environment Experiment). Launched April 2001. 100 100 100 100 100 100 add A-1 aircraft Skyraider aircraft 37801 NASA Thesaurus 100 100 100 100 100 add A-2 aircraft Savage aircraft 37803 NASA Thesaurus 100 100 100 100 100 100 add A-3 aircraft A3D aircraft Skywarrior aircraft 37804 NASA Thesaurus 100 100 100 100 100 100 100 add A-4 aircraft A4D aircraft Skyhawk aircraft 37811 NASA Thesaurus 100 100 100 100 100 100 100 100 add A-5 aircraft A3J aircraft Vigilante aircraft 37812 NASA Thesaurus 100 100 100 100 100 100 100 100 add A-6 aircraft A2F aircraft Intruder aircraft 37813 NASA Thesaurus 100 100 100 100 100 100 100 add A-7 aircraft Corsair aircraft 37814 NASA Thesaurus 100 100 100 100 100 100 add A-9 aircraft 37815 NASA Thesaurus 100 100 100 100 add A-10 aircraft 37802 NASA Thesaurus 100 100 100 add A-11 satellite 182145 NASA Thesaurus 100 add A-12 satellite 182146 NASA Thesaurus 100 add A-37 aircraft 37810 NASA Thesaurus 100 100 100 100 100 100 add A-300 aircraft 37805 NASA Thesaurus 100 100 100 add A-310 aircraft 37806 NASA Thesaurus 100 100 add A-320 aircraft 37807 NASA Thesaurus 100 100 add A-330 aircraft 37808 NASA Thesaurus 100 100 100 add A-340 aircraft 37809 NASA Thesaurus 100 100 100 add A-380 aircraft 56055 NASA Thesaurus 100 100 100 add A2F aircraft 182147 NASA Thesaurus 100 add A3D aircraft 182148 NASA Thesaurus 100 add A3J aircraft 182149 NASA Thesaurus 100 add A4D aircraft 182150 NASA Thesaurus 100 add AABNCP 182151 NASA Thesaurus 100 add AAP 1 mission 37816 NASA Thesaurus 100 100 100 add AAP 2 mission 37817 NASA Thesaurus 100 100 100 add AAP 3 mission 37818 NASA Thesaurus 100 100 100 add AAP 4 mission 37819 NASA Thesaurus 100 100 100 add abbreviations acronyms initialisms 37820 NASA Thesaurus 100 100 100 100 100 100 100 100 add abdomen 37821 NASA Thesaurus 100 100 100 100 100 100 100 100 add Abel function 37822 NASA Thesaurus 100 100 100 add aberration 60491 NASA Thesaurus Definition Source Definition SP-7 1968 In astronomy, the apparent angular displacement of the position of a celestial body in the direction of motion of the observer, caused by the combination of the velocity of the observer and the velocity of light. In optics, a specific deviation from perfect imagery, as, for example: spherical aberration, coma, astigmatism, curvature of field, and distortion. 100 100 100 100 100 100 100 100 100 100 add abilities proficiency skills 37824 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add abiogenesis 60492 NASA Thesaurus Definition Source Definition AGI The development of living organisms from lifeless matter. 100 100 100 100 100 100 100 100 add ablated nosetips 182152 NASA Thesaurus 100 add ablation 60493 NASA Thesaurus Definition Source Definition SP-7 1968 The removal of surface material from a body by vaporization, melting, chipping, or other erosive process; specifically, the intentional removal of material from a nose cone or spacecraft during high speed movement through a planetary atmosphere to provide thermal protection to the underlying structure. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ablative materials 60494 NASA Thesaurus Definition Source Definition SP-7 1968 Materials, especially coating materials, designed to provide thermal protection to a body in a fluid stream through the loss of mass. 100 100 100 100 100 100 100 100 100 100 100 100 100 add ablative nose cones 37828 NASA Thesaurus 100 100 100 100 100 100 100 add Ablestar launch vehicle 37829 NASA Thesaurus 100 100 100 add ABM 182153 NASA Thesaurus 100 add abnormalities 37830 NASA Thesaurus 100 100 100 100 100 100 add aborigines 37831 NASA Thesaurus 100 100 100 add abort apparatus flight termination systems 37832 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add abort trajectories 37833 NASA Thesaurus 100 100 100 100 add aborted missions 37834 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add abrasion 60495 NASA Thesaurus Definition Source Definition ASTM (D 1566, D-11) 1968 The surface loss of a material due to frictional forces. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add abrasion resistance 37836 NASA Thesaurus 100 100 100 100 add abrasives 60496 NASA Thesaurus Definition Source Definition ASTM (D 653, D-18) 1968 Rocks, minerals, or other substances that, owing to their superior hardness, toughness, consistency, or other properties, are suitable for grinding, cutting, polishing, scouring, or similar use. 100 100 100 100 100 100 100 100 100 100 add Abrikosov theory 37838 NASA Thesaurus 100 100 100 100 100 100 100 add abscisic acid 64744 NASA Thesaurus Definition Source Definition MESH Abscission-accelerating plant growth substance isolated from young cotton fruit, leaves of sycamore, birch, and other plants, and from potatoes, lemons, avocados, and other fruits. 100 100 100 100 100 add absolute zero 60497 NASA Thesaurus Definition Source Definition 1980 Temperature of -273.16 deg. C or -459.69 deg. F or 0 deg. K at which molecular motion vanishes and a body has no heat energy. 100 100 100 100 100 100 100 add absorbents molecular sieves 37840 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add ~ absorbers 37841 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 add absorbers (equipment) 37842 NASA Thesaurus Scope Note EXCLUDES EQUIPMENT FOR ABSORBING ENERGY 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add absorbers (materials) 37843 NASA Thesaurus Scope Note EXCLUDES ABSORBENTS--LIMITED TO MATERIALS FOR ABSORBING RADIATION RATHER THAN OTHER MATERIALS 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add absorptance 60498 NASA Thesaurus Definition Source Definition SP-7 1968 The ratio of the radiant flux absorbed by a body to that incident upon it. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ~ absorption 60499 NASA Thesaurus Scope Note Definition Source Definition USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW SP-7 1968 The process by which radiant energy is absorbed and converted into other forms of energy. In general, the taking up or assimilation of one substance by another. In vacuum technology, gas entering the interior of a solid. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add absorption bands 182154 NASA Thesaurus 100 add absorption coefficient 182155 NASA Thesaurus 100 add absorption cooling 60500 NASA Thesaurus Definition Source Definition 1980 Refrigeration in which cooling is effected by the expansion of liquid ammonia into gas and the absorption of the gas by water. The ammonia is reused after the water evaporates. 100 100 100 100 100 add absorption cross sections capture cross sections 60501 NASA Thesaurus Definition Source Definition SP-7 1968 In radar, cross sections characterized by the amount of power removed from a beam by absorption of radio energy by a target to the power in the beam incident upon the target. Used for capture cross sections. 100 100 100 100 100 100 100 100 add absorption spectra absorption bands spectral absorption 60502 NASA Thesaurus Definition Source Definition SP-7 1968 The arrays of absorption lines and absorption bands which result from the passage of radiant energy from a continuous source through a selectively absorbing medium cooler than the source. Used for absorption bands and spectral absorption. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add absorption spectroscopy 37849 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add absorptive index 182156 NASA Thesaurus 100 add absorptivity absorption coefficient absorptive index 60503 NASA Thesaurus Definition Source Definition SP-7 1968 The capacity of a material to absorb incident radiant energy, measured as the absorptance of a specimen of material thick enough to be completely opaque, and having an optically smooth surface. Used for absorption coefficient and absorptive index. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add abstracts 37851 NASA Thesaurus 100 100 100 100 100 100 100 add abundance element abundance 60504 NASA Thesaurus Definition Source Definition AGI 1968 The mean concentration of an element in a geochemical reservoir, e.g., the abundance of Ni in meteorites or the crustal abundance of oxygen. Also used for the for relative average content, e.g., the order of abundance of elements in the Earth's crust is O, Si, AL, Fe, Ca, etc. Used for element abundance. 100 100 100 100 100 100 100 100 100 add AC-1 aircraft 182158 NASA Thesaurus 100 add AC (current) 182157 NASA Thesaurus 100 add AC generators alternating current generators alternators (generators) 60505 NASA Thesaurus Definition Source Definition IEEE 1968 Generators for the production of alternating-current power. Used for alternating current generators and alternators (generators). 100 100 100 100 100 100 100 100 100 100 add accelerated life tests 60506 NASA Thesaurus Definition Source Definition ASTM (D 1566, D-11) 1969 Methods designed to approximate, in a short time, the deteriorating effects under normal long-term service conditions. 100 100 100 100 100 100 100 100 add accelerating agents 37855 NASA Thesaurus 100 100 100 100 100 add ~ acceleration 60507 NASA Thesaurus Scope Note Definition Source Definition USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW NASA CASI The time rate of change of velocity. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acceleration measurement 55502 NASA Thesaurus Scope Note LIMITED TO TECHNIQUES AND INSTRUMENTATION FOR DETERMINING THE DIRECTION AND MAGNITUDE OF ACCELERATION; USE TERMS FROM THE "ACCELERATION (PHYSICS)" HIERARCHY TO INDICATE THE DATA OBTAINED FROM MEASUREMENT 100 100 100 100 100 100 100 100 add acceleration (physics) boost G force 60508 NASA Thesaurus Definition Source Definition SP-7 1968 The rate of change of velocity. The act or process of accelerating or the state of being accelerated. Used for boost and G force. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acceleration protection 37858 NASA Thesaurus 100 100 100 100 add acceleration stresses (physiology) 37859 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acceleration tolerance 37860 NASA Thesaurus Scope Note LIMITED TO ABILITY OF ORGANISMS TO WITHSTAND ACCELERATION--FOR EFFECTS ON EQUIPMENT, USE SHOCK RESISTANCE AND MECHANICAL SHOCK 100 100 100 100 100 100 100 100 100 100 add ~ accelerators 60509 NASA Thesaurus Scope Note Definition Source Definition USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW ASTM (E 385, E-10) 1968 Machines that ionize gases and electrically accelerate the ions onto targets. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add accelerometers 60510 NASA Thesaurus Definition Source Definition SP-7 1968 Transducers which measure acceleration or gravitational forces capable of imparting acceleration. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acceptability acceptance 37863 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acceptance 182159 NASA Thesaurus 100 add acceptor materials 37864 NASA Thesaurus 100 100 100 100 100 add access control 60511 NASA Thesaurus Definition Source Definition IEEE 1980 Hardware or software features, operating procedures, or management procedures designed to permit authorized access to a computer system. 100 100 100 100 100 100 100 100 100 100 100 add access time 37866 NASA Thesaurus 100 100 100 100 100 100 add accessories attachments 37867 NASA Thesaurus 100 100 100 100 100 100 add accident investigation 37868 NASA Thesaurus 100 100 100 100 100 100 add accident prevention precautions 37869 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add accident proneness 37870 NASA Thesaurus 100 100 add accidents 37871 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acclimatization deacclimatization 60512 NASA Thesaurus Definition Source Definition SP-7 1968 The adjustments of a human body or other organism to a new environment; the bodily changes which tend to increase efficiency and reduce energy loss. Used for deacclimatization. 100 100 100 100 100 100 100 100 100 100 add accommodation 37873 NASA Thesaurus 100 100 100 100 100 add accommodation coefficient thermal accommodation coefficients 60513 NASA Thesaurus Definition Source Definition SP-7 1968 The ratio of the average energy actually transferred between a surface and impinging gas molecules which are scattered by the surface to the average energy which would theoretically be transferred if the impinging molecules reached complete thermal equilibrium with the surface before leaving the surface. Used for thermal accommodation coefficients. 100 100 100 add accounting 60514 NASA Thesaurus Definition Source Definition 1982 The practice and system of recording and summarizing business and financial transactions, and reporting as well as verifying and analyzing their results. 100 100 100 add accretion 182160 NASA Thesaurus 100 add accretion disks 60515 NASA Thesaurus Definition Source Definition 1982 Rotation disks of matter surrounding an astronomical object, such as a star, galactic nucleus, black hole, etc., which is accumulated gravitationally by the object. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add accumulations 37877 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add accumulators collectors 60516 NASA Thesaurus Definition Source Definition SP-7 1968 Devices or apparatus that accumulate or store. Used for collectors. 100 100 100 100 100 100 100 100 100 100 add accumulators (computers) 60517 NASA Thesaurus Definition Source Definition SP-7 1968 In computer technology, devices which store a number and upon receipt of another number add it to the number already stored and store the sum. 100 100 100 100 100 add accuracy error band fidelity 60518 NASA Thesaurus Definition Source Definition ASTM (E 319, E-41) 1968 The degree of agreement of the measurements with the true value of the magnitude of the quantity measured. Used for error band and fidelity. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ACE satellite 182161 NASA Thesaurus 100 add ACEE program Aircraft Energy Efficiency program Energy Efficiency Transport program 60519 NASA Thesaurus Definition Source Definition 1982 A NASA program started in 1975 to reduce fuel consumption for transport aircraft through the study of structural and aerodynamic energy efficiency as well as engine energy efficiency consisting of engine component improvement, new energy efficient engines, and advanced turbopropellers. The acronym stands for aircraft energy efficiency. Used for Aircraft Energy Efficiency program and energy efficiency transport program. 100 100 100 100 100 add acetaldehyde 37882 NASA Thesaurus 100 add acetals 37883 NASA Thesaurus 100 add acetanilide phenacetin 37884 NASA Thesaurus 100 100 add acetates 37885 NASA Thesaurus 100 100 100 100 100 100 100 100 add acetation 182162 NASA Thesaurus 100 add acetazolamide 37886 NASA Thesaurus 100 100 100 100 add acetic acid 37887 NASA Thesaurus 100 100 100 100 100 100 add acetone 37888 NASA Thesaurus 100 100 100 add acetonitrile ethane nitrile methyl cyanide 37889 NASA Thesaurus 100 100 100 100 100 add acetyl compounds 37890 NASA Thesaurus 100 100 100 100 100 100 100 100 add acetylacetone 37891 NASA Thesaurus 100 100 100 100 add acetylation acetation 60520 NASA Thesaurus Definition Source Definition ASTM (D 1695, D-23) 1968 Substitution of an acetyl radical for an active hydrogen. Specifically, formation of cellulose acetate from cellulose. Used for acetation. 100 100 100 add acetylcholine 64694 NASA Thesaurus Definition Source Definition NASA A major neurotransmitter in vertebrates at neuromuscular junctions, autonomic ganglia, parasympathetic effector junctions, a subset of sympathetic effector junctions, and at many sites in the central nervous system. 100 100 100 100 100 add acetylene 37893 NASA Thesaurus 100 100 100 100 add acetylsalicylic acid ASA 37894 NASA Thesaurus 100 100 100 100 100 add achievement 37895 NASA Thesaurus 100 100 100 add achondrites 37896 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add acid base equilibrium 37897 NASA Thesaurus 100 100 100 100 100 100 100 add acid rain 60521 NASA Thesaurus Definition Source Definition 1977 Low pH rainfall resulting from atmospheric reactions of aerosols containing chlorides and sulfates (or other negative ions). 100 100 100 100 100 100 100 100 100 100 100 add acidity 37899 NASA Thesaurus 100 100 100 100 100 add acidosis 60522 NASA Thesaurus Definition Source Definition NASA CASI Reduction of alkali reserves due to an excess of acid metabolites. 100 100 100 100 100 add acids 37901 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acoustic attenuation 37902 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add acoustic combustion 182163 NASA Thesaurus 100 add acoustic coupling 37903 NASA Thesaurus 100 100 100 100 100 100 100 add acoustic delay lines sonic waveguides 60523 NASA Thesaurus Definition Source Definition SP-7 1968 Devices used in a communications link or a computer memory in which the signal is delayed by the propagation of sound waves. Used for sonic waveguides. 100 100 100 100 100 100 add acoustic detection 182164 NASA Thesaurus 100 add acoustic ducts 37905 NASA Thesaurus 100 100 100 100 add acoustic emission 60524 NASA Thesaurus Definition Source Definition 1977 The stress and pressure waves generated during dynamic processes in materials and used in assessing structural integrity in machined parts. 100 100 100 100 100 100 100 add acoustic excitation 60525 NASA Thesaurus Definition Source Definition SP-7 1968 The process of inducing vibration in a structure by exposure to sound waves. 100 100 100 100 100 100 100 add acoustic fatigue sonic fatigue 37908 NASA Thesaurus 100 100 100 add acoustic frequencies sound frequencies 37909 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acoustic generators 182165 NASA Thesaurus 100 add acoustic imaging 37910 NASA Thesaurus 100 100 100 100 100 100 add acoustic impedance 37911 NASA Thesaurus 100 100 100 100 100 add acoustic instability 37912 NASA Thesaurus 100 100 100 100 add acoustic levitation 60526 NASA Thesaurus Definition Source Definition 1980 Method by which molten materials in space are suspended during processing experiments in the low gravity environment. Also, the use of very intense sound waves to keep a body suspended, thereby eliminating any container contact. 100 100 100 add acoustic measurement sound measurement 60527 NASA Thesaurus Scope Note Definition Source Definition MEASUREMENT OF PROPERTIES, QUANTITIES OR CONDITIONS ASSOCIATED WITH ELASTIC WAVES DOE 1968 Measurement of properties, quantities, or conditions of acoustical, i.e., mechanical waves. Used for sound measurement. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acoustic microscopes scanning laser acoustic microscope (SLAM) 60528 NASA Thesaurus Definition Source Definition 1980 Instruments which use acoustic radiation at microwave frequencies to allow visualization of microscopic detail exhibited in elastic properties of objects. Used for scanning laser acoustic microscope (SLAM). 100 100 100 100 100 100 100 100 add acoustic nozzles 37916 NASA Thesaurus 100 100 100 add acoustic propagation 37917 NASA Thesaurus 100 100 100 100 100 100 100 100 add acoustic properties 37918 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acoustic radiation 182166 NASA Thesaurus 100 add acoustic resonance 55517 NASA Thesaurus 100 100 100 100 100 100 add acoustic retrofitting 60529 NASA Thesaurus Definition Source Definition 1977 Modification, especially of aircraft, to effect noise reduction; specifically, the introduction of absorber materials and jet noise silencers. 100 100 100 100 100 100 100 100 100 100 add acoustic scattering 37920 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add acoustic simulation 37921 NASA Thesaurus 100 100 100 100 add acoustic sounding 37922 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add acoustic stability 182167 NASA Thesaurus 100 add acoustic streaming 60530 NASA Thesaurus Definition Source Definition SP-7 1968 Unidirectional flow currents in a fluid that are due to the presence of sound waves. 100 100 100 100 100 add acoustic velocity sonic speed sound barrier sound velocity 60531 NASA Thesaurus Definition Source Definition SP-7 1968 The speed of propagation of sound waves. Used for sonic speed, sound barrier, and sound velocity. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acoustic vibrations 182168 NASA Thesaurus 100 add acoustical holography sonoholography sound holography 37925 NASA Thesaurus 100 100 100 100 100 100 100 100 add acoustics sound 60532 NASA Thesaurus Definition Source Definition SP-7 1968 The study of sound, including its production, transmission, and effects. Those qualities of an enclosure that together determine its character with respect to distinct hearing. Used for sound. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acousto-optics 37927 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ACPL (Spacelab) 182169 NASA Thesaurus 100 add acquired immunodeficiency syndrome AIDS (disease) 60533 NASA Thesaurus Definition Source Definition 1989 A condition caused by the human immunodeficiency virus (HIV) attacking the human body's T-cells, thereby rendering an infected individual defenseless against diseases. 100 100 100 100 100 100 100 100 100 100 100 100 100 add acquisition 37929 NASA Thesaurus 100 100 100 100 100 100 100 100 add acriflavine 37930 NASA Thesaurus 100 100 100 add acrobatics (aircraft) 182170 NASA Thesaurus 100 add acroleins 37931 NASA Thesaurus 100 100 add acronyms 182171 NASA Thesaurus 100 add ACRV 182172 NASA Thesaurus 100 add acrylates 37932 NASA Thesaurus 100 100 add acrylic acid 37933 NASA Thesaurus 100 add acrylic resins methacrylate resins polyacrylates 37934 NASA Thesaurus 100 100 100 100 100 100 add acrylonitriles vinyl cyanide 37935 NASA Thesaurus 100 100 100 100 add ACTH 182173 NASA Thesaurus 100 add actinide series 60534 NASA Thesaurus Definition Source Definition ASTM (C 859, C-26) 1968 The series of elements beginning with actium, Element No. 89, and continuing through lawrencium, Element No. 103. 100 100 100 100 100 100 100 100 100 100 add actinide series compounds 37937 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add actinium 37938 NASA Thesaurus 100 add actinographs 182174 NASA Thesaurus 100 add actinometers actinographs emissographs 60535 NASA Thesaurus Definition Source Definition SP-7 1968 The general name for instruments used to measure the intensity of radiant energy, particularly that of the sun. Used for actinographs and emissographs. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add actinomycetes 37940 NASA Thesaurus 100 add actinomycin 37941 NASA Thesaurus 100 add activated carbon 37942 NASA Thesaurus 100 100 100 100 100 100 add activated sludge 60536 NASA Thesaurus Definition Source Definition 1977 A semiliquid mass removed from the liquid flow of sewage and subjected to aeration and aerobic microbial action. The end product is dark to golden brown, partially decomposed, granular and flocculent, and has an earthy odor when fresh. 100 100 100 100 100 100 add activation 37944 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add activation analysis 60537 NASA Thesaurus Definition Source Definition DNA A method of chemical analysis, especially for small traces of materials, based on the detection of characteristic radiations following a nuclear bombardment. 100 100 add activation (biology) 37945 NASA Thesaurus 100 100 100 100 100 add activation energy 37947 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add active control 60538 NASA Thesaurus Definition Source Definition 1980 The automatic activation of various control surface functions in aircraft. 100 100 100 100 100 100 100 100 100 100 add active galactic nuclei 37949 NASA Thesaurus 100 100 100 100 100 100 100 100 add active galaxies 37950 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add active glaciers 182175 NASA Thesaurus 100 add Active Magneto Particle Tracer Explorers 182176 NASA Thesaurus 100 add active satellites 60539 NASA Thesaurus Definition Source Definition SP-7 1968 Satellites which transmit a signal, in contrast to passive satellites. 100 100 100 100 100 100 100 100 100 100 100 100 100 add active sites (chemistry) binding sites catalytic sites reactive centers 64684 NASA Thesaurus Definition Source Definition MESH The reactive parts of a molecule that directly participate in its specific combination with another molecule. 100 100 100 100 100 100 100 add active volcanoes 182177 NASA Thesaurus 100 add ~ activity 37952 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 add activity (biology) biological activity 37953 NASA Thesaurus 100 100 100 100 100 add activity cycles (biology) 37954 NASA Thesaurus 100 100 100 100 100 100 100 add ACTS Advanced Communications Technology Sat 37955 NASA Thesaurus Scope Note ADVANCED COMMUNICATIONS TECHNOLOGY SATELLITE 100 100 100 100 100 add actuation 37956 NASA Thesaurus 100 100 100 100 100 100 100 100 add actuator disks 37957 NASA Thesaurus 100 100 100 100 add actuators cartridge actuated devices hydraulic actuators triggers 60540 NASA Thesaurus Definition Source Definition DOE 1968 Mechanisms to activate process control equipment, e.g., valves. Used for cartridge actuated devices, hydraulic actuators, and triggers. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add acuity 60541 NASA Thesaurus Definition Source Definition ASTM (E 253, E-18) 1968 The keeness of ability to detect and discriminate. 100 100 100 100 100 100 100 add acylation 37960 NASA Thesaurus 100 100 100 add AD-A satellite 182180 NASA Thesaurus 100 add AD/I B 182178 NASA Thesaurus 100 add AD/I satellite 182179 NASA Thesaurus 100 add Ada (programming language) 60542 NASA Thesaurus Definition Source Definition 1982 A programming language based on PASCAL, originally developed on behalf of the US Department of Defense for use in embedded computer systems. It is named Ada in honor of Augusta Ada Byron, countess of Lovelace, primarily due to the fact that she was the assistant and patron of Charles Babbage and is considered the world's first programmer. 100 100 100 100 add adaptation 60543 NASA Thesaurus Definition Source Definition SP-7 1968 The adjustment, alteration or modification of an organism to fit it more perfectly for existence in its environment. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add adapters 60544 NASA Thesaurus Definition Source Definition SP-7 1968 Devices or contrivances used or designed primarily to fit or adjust one thing to another. Devices, appliances or the like used to alter something so as to make it suitable for a use for which it was not originally designed. 100 100 100 100 100 add adaptive control adaptive control systems 37964 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add adaptive control systems 182181 NASA Thesaurus 100 add adaptive filters 37965 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add adaptive optics 60545 NASA Thesaurus Definition Source Definition 1977 Real-time optical correction for atmospheric perturbations and other system error sources. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add adatoms adsorbed atoms 64621 NASA Thesaurus Definition Source Definition NASA Atoms adsorbed on a solid surface. Adatoms and their associated properties are often exploited in the development of microelectronic and nanoelectronic structures. 100 100 100 100 100 100 100 100 100 100 add adders (circuits) 182182 NASA Thesaurus 100 add adding circuits adders (circuits) binary summators 37967 NASA Thesaurus 100 100 100 100 100 100 100 add addition 37968 NASA Thesaurus 100 100 100 100 100 100 add addition resins 37969 NASA Thesaurus Scope Note CARBON CHAIN POLYMERS--FOR HETEROATOM CHAIN POLYMERS, USE POLYETHER RESINS 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add addition theorem 37970 NASA Thesaurus 100 100 100 add additives doping (additives) 60546 NASA Thesaurus Definition Source Definition SP-7 1968 Materials or substances added to something else for a specific purpose. Used for doping (additives). 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add addressing 37972 NASA Thesaurus 100 100 add adducts 60547 NASA Thesaurus Definition Source Definition DOE 1968 Chemical compounds with weak bonds, e.g., occlusive or Van der Waal bonds. 100 add Aden 182183 NASA Thesaurus 100 add adenines 37974 NASA Thesaurus 100 100 100 100 100 100 add adenosine diphosphate ADP 37975 NASA Thesaurus 100 100 100 100 add adenosine monophosphate adenylic acid AMP (biochemistry) 64696 NASA Thesaurus Definition Source Definition MESH Adenine nucleotide containing one phosphate group. 100 100 100 100 100 100 100 100 add adenosine triphosphate ATP 37976 NASA Thesaurus 100 100 100 100 100 100 100 add adenosines 37977 NASA Thesaurus 100 100 100 100 100 100 100 add adenosinetriphosphatase 56026 NASA Thesaurus 100 add adenoviruses 37978 NASA Thesaurus 100 add adenylic acid 182184 NASA Thesaurus 100 add adequacy 37979 NASA Thesaurus 100 100 add adherometers 182185 NASA Thesaurus 100 add adhesion 37980 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add adhesion tests adherometers Fokker bond testers 37981 NASA Thesaurus 100 100 100 100 100 100 100 add adhesive bonding 37982 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add adhesives binders (adhesives) 37983 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ADI methods 182186 NASA Thesaurus 100 add adiabatic conditions 37984 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add adiabatic demagnetization cooling 60548 NASA Thesaurus Definition Source Definition 1980 Use of paramagnetic salts cooled to the boiling point of helium in a strong magnetic field, then thermally isolated and removed from the field to demagnetize the salts and attain temperatures of 10(-3) K. 100 add adiabatic equations 37986 NASA Thesaurus 100 100 100 100 100 add adiabatic flow 37987 NASA Thesaurus 100 100 add adipose tissues 37988 NASA Thesaurus 100 100 add Adiprene (trademark) 37989 NASA Thesaurus 100 add Adirondack Mountains (NY) 37990 NASA Thesaurus 100 100 add adjoints 37991 NASA Thesaurus 100 100 100 add adjusting adjustment readjustment 37992 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add adjustment 182187 NASA Thesaurus 100 add administration 182188 NASA Thesaurus 100 add admittance 182189 NASA Thesaurus 100 add admixtures 37993 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add adobe flats 182190 NASA Thesaurus 100 add ADP 182191 NASA Thesaurus 100 add Adrastea 60549 NASA Thesaurus Definition Source Definition CASI A natural satellite of Jupiter orbiting at a mean distance of 129,980 kilometers. 100 100 add adrenal gland 37995 NASA Thesaurus 100 100 100 100 add adrenal metabolism 37996 NASA Thesaurus 100 100 100 100 100 add adrenaline 182192 NASA Thesaurus 100 add adrenergics sympathomimetics 37997 NASA Thesaurus 100 100 100 100 100 add adrenocorticotropin (ACTH) ACTH 37998 NASA Thesaurus 100 100 100 100 100 100 add Adriatic Sea 37999 NASA Thesaurus 100 100 100 add adsorbed atoms 182193 NASA Thesaurus 100 add adsorbents 60550 NASA Thesaurus Definition Source Definition SP-7 1968 Materials which take up gases by adsorption. 100 100 100 100 100 100 100 add adsorption 60551 NASA Thesaurus Definition Source Definition SP-7 1968 The adhesion of a thin film of liquid or gas to the surface of a solid substance. The solid does not combine chemically with the adsorbed substance. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add adsorptivity 38002 NASA Thesaurus 100 100 100 100 100 add adults 64735 NASA Thesaurus Definition Source Definition MESH A person having attained full growth or maturity. 100 100 100 100 100 100 100 add Advanced Airborne Command Post 182194 NASA Thesaurus 100 add Advanced Communications Technology Sat 182195 NASA Thesaurus 100 add Advanced Composition Explorer ACE satellite Explorer 71 satellite 64449 NASA Thesaurus Definition Source Definition NASA Explorer spacecraft (launched August 25, 1997) carrying six high-resolution sensors and three monitoring instruments for sampling low-energy particles of solar origin and high-energy galactic particles. From a vantage point approximately 1/100 of the distance from the Earth to the Sun, the Advanced Composition Explorer (ACE) can perform measurements over a wide range of energy and nuclear mass, under all solar wind flow conditions and during both large and small particle events including solar flares. When reporting space weather ACE can provide an advance warning of geomagnetic storms. 100 100 100 100 100 100 100 100 100 100 add Advanced EVA Protection Systems 182196 NASA Thesaurus 100 add Advanced Launch System (STS) ALS (launch system) 38003 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add Advanced Microwave Sounding Unit AMSU (radiometer) 64379 NASA Thesaurus Definition Source Definition NASA A line-scan instrument on the Advanced TIROS-N (ATN) NOAA K-N series of operational meteorological satellites. The AMSU consists of two functionally independent units, AMSU-A and AMSU-B. The AMSU-A is designed to measure scene radiance in 15 channels, ranging from 23.8 to 89 GHz, to derive atmospheric temperature profiles from the Earth surface to about 3 millibar pressure height. The AMSU-B is designed to measure scene radiance in five channels, ranging from 89 GHz to 183 GHz for the computation of atmospheric water vapor profiles. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Advanced Orbiting Solar Observatory 182197 NASA Thesaurus 100 add Advanced Range Instrumentation Aircraft 60552 NASA Thesaurus Definition Source Definition 1981 An EC-135 aircraft configured for reception recording and real-time relay of telemetry data. 100 100 100 100 100 100 add Advanced Range Instrumentation Ship ARIS instrumentation ship 38005 NASA Thesaurus 100 100 100 100 100 100 add Advanced Reconn Electric Spacecraft ARES (spacecraft) 38006 NASA Thesaurus 100 100 100 add advanced sodium cooled reactor ASCR reactor 38007 NASA Thesaurus 100 100 add Advanced Solid Rocket Motor (STS) ASRM (STS) 38008 NASA Thesaurus 100 100 100 100 add advanced tactical fighter 182198 NASA Thesaurus 100 add Advanced Technology Laboratory 60553 NASA Thesaurus Definition Source Definition 1985 An all-pallet payload utilizing the Space Shuttle and the European Spacelab and designed to accommodate 8 to 15 experiments per mission. 100 100 100 add Advanced Technology Light Twin aircraft 182199 NASA Thesaurus 100 add advanced test reactors ATR reactor 38010 NASA Thesaurus 100 100 add Advanced Very High Resolution Radiometer AVHRR 60554 NASA Thesaurus Definition Source Definition 1988 A five channel scanning instrument that quantitatively measures electromagnetic radiation. 100 100 100 100 100 100 100 100 100 100 100 add Advanced Vidicon Camera System (AVCS) AVCS 38012 NASA Thesaurus 100 100 100 100 100 100 add Advanced X Ray Astrophysics Facility 182200 NASA Thesaurus 100 add advancing glaciers 182201 NASA Thesaurus 100 add advancing shorelines 182202 NASA Thesaurus 100 add advection 60555 NASA Thesaurus Definition Source Definition SP-7 1968 The process of transport of an atmospheric property solely by the mass motion of the atmosphere; also, the rate of change of the value of the advected property at a given point. 100 100 100 100 100 add Advent Project 38014 NASA Thesaurus 100 100 100 100 100 add AE-A satellite 182203 NASA Thesaurus 100 add AE-B satellite 182204 NASA Thesaurus 100 add AE-C satellite 182205 NASA Thesaurus 100 add AE-D satellite 182206 NASA Thesaurus 100 add AE-E satellite 182207 NASA Thesaurus 100 add aeolian tones 38015 NASA Thesaurus 100 100 100 100 100 100 add aeolotropism 38016 NASA Thesaurus 100 100 add AEPS Advanced EVA Protection Systems 38017 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add aeration 38018 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerial acrobatics 182208 NASA Thesaurus 100 add aerial explosions air blasts 38019 NASA Thesaurus Scope Note LIMITED TO EXPLOSIONS OCCURRING AT HEIGHTS LESS THAN 50 KM 100 100 100 100 100 100 add aerial imagery 182209 NASA Thesaurus 100 add aerial photography aerial imagery 38020 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerial reconnaissance 38021 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerial rudders 38022 NASA Thesaurus 100 100 100 100 100 100 100 100 add aeroacoustics 38023 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aeroassist 60556 NASA Thesaurus Definition Source Definition 1982 Changing orbit size by utilizing aerobraking, aerocapture, or aeromaneuvering. 100 100 100 100 100 100 add aerobatics acrobatics (aircraft) aerial acrobatics stunt flying 38025 NASA Thesaurus 100 100 100 100 100 100 add Aerobee rocket vehicle 38026 NASA Thesaurus 100 add aerobes 38027 NASA Thesaurus 100 100 100 100 add aerobiology 60557 NASA Thesaurus Definition Source Definition SP-7 1968 The study of the distribution of living organisms freely suspended in the atmosphere. 100 100 100 100 100 add aerobraking 60558 NASA Thesaurus Definition Source Definition 1982 Changing orbit size by using the upper atmosphere to create drag. 100 100 100 100 100 add aerocapture 60559 NASA Thesaurus Definition Source Definition 1982 Making use of the atmosphere of a planet or planetary satellite by capturing the object and reducing the orbit size so that it remains in orbit or lands on the body. 100 100 100 100 100 100 add aerodontalgia 182210 NASA Thesaurus 100 add aerodynamic axis 182211 NASA Thesaurus 100 add aerodynamic balance aerodynamic axis aerodynamic center drag balance trim (balance) 38031 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic brakes 38032 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic buzz 182212 NASA Thesaurus 100 add aerodynamic center 182213 NASA Thesaurus 100 add aerodynamic characteristics 38033 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic chords 182214 NASA Thesaurus 100 100 add aerodynamic coefficients lift coefficients 60560 NASA Thesaurus Definition Source Definition SP-7 1968 Any nondimensional coefficients relating to aerodynamic forces or moments, such as a coefficient of drag, a coefficient of lift, etc. Used for lift coefficients. 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic configurations 38035 NASA Thesaurus Scope Note LIMITED TO AERODYNAMIC VEHICLE SHAPES--FOR LIFTING OR THRUSTING SURFACES USE AIRFOILS 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic drag 38036 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic forces Glauert coefficient 60561 NASA Thesaurus Definition Source Definition SP-7 1968 The force exerted by a moving gaseous fluid upon a body completely immersed in it. Used for Glauert coefficient. 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic heat transfer 38038 NASA Thesaurus 100 100 100 100 100 100 add aerodynamic heating 60562 NASA Thesaurus Definition Source Definition DOE 1968 The heating of a body produced by the passage of air or other gases over its surface. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic interference 38040 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic lift 182215 NASA Thesaurus 100 add aerodynamic loads 38041 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic moments 182216 NASA Thesaurus 100 add aerodynamic noise boundary layer noise 38042 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic stability flying platform stability 38043 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic stalling 38044 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add aerodynamic vehicles 182217 NASA Thesaurus 100 add aerodynamics hydroaeromechanics 60563 NASA Thesaurus Definition Source Definition SP-7 1968 The science that deals with the motion of air and other gaseous fluids, and the forces acting on bodies when the bodies move through such fluids, or when such fluids move against or around the bodies. Used for hydroaeromechanics. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aeroelastic research wings 60564 NASA Thesaurus Definition Source Definition 1983 Wings that are designed with less than normal stiffness to test devices that suppress flutter. 100 100 100 100 100 100 add aeroelasticity 60565 NASA Thesaurus Definition Source Definition SP-7 1968 The study of the response of structurally elastic bodies to aerodynamic loads. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aeroembolism 60566 NASA Thesaurus Definition Source Definition SP-7 1968 The formation or liberation of gases in the blood vessels of the body, as brought on by a too-rapid change from a high, or relatively high, atmospheric pressure to a lower one. 100 100 100 100 100 add aerogels 38049 NASA Thesaurus 100 100 100 100 100 add aerogyro helicopters 182218 NASA Thesaurus 100 add aerology 60567 NASA Thesaurus Definition Source Definition SP-7 1968 The study of the free atmosphere throughout its vertical extent, as distinguished from studies confined to the layer of the atmosphere adjacent to the Earth's surface. 100 100 100 100 100 100 100 add aeromagnetism 38051 NASA Thesaurus 100 100 100 100 100 100 add aeromagneto flutter 182219 NASA Thesaurus 100 add aeromaneuvering 60568 NASA Thesaurus Definition Source Definition 1982 Changing orbit size or plane or both by entering the upper atmosphere to create drag or lift or both. 100 100 100 100 100 100 100 add Aeromaneuvering Orbit to Orbit Shuttle AMOOS 60569 NASA Thesaurus Definition Source Definition 1979 Proposed reusable upper stage for the Space Shuttle superseded by the orbit transfer vehicle. Used for AMOOS. 100 100 100 100 100 100 add aeronautical engineering 38054 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add aeronautical satellites 38055 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add ~ aeronautics aviation 38056 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aeronomy 60570 NASA Thesaurus Definition Source Definition SP-7 1968 The study of the upper regions of the atmosphere where ionization, dissociation, and chemical reactions take place. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerophysics 182220 NASA Thesaurus 100 add aeroquatic vehicles 38058 NASA Thesaurus 100 100 100 100 100 add AEROS satellite 38059 NASA Thesaurus 100 100 add Aerosat satellites 38060 NASA Thesaurus 100 100 100 100 100 100 add aeroservoelasticity ASE (aerodynamics) 38061 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add aeroshells 64432 NASA Thesaurus Definition Source Definition NASA Aerodynamic structural shells that attach to, or comprise a portion of, the exterior of an aerospace vehicle or space probe; especially such structures that support atmospheric entry, aerobraking, aeroassist, or hypersonic flight. 100 100 100 100 100 100 100 add aerosinusitis 38062 NASA Thesaurus 100 100 100 add aerosols 60571 NASA Thesaurus Definition Source Definition ASTM (D 1356, D-22) 1968 Dispersions of solid or liquid particles in gaseous media. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerospace engineering space systems engineering 38064 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add aerospace environments space environment 38065 NASA Thesaurus Scope Note EXCLUDES SPACECRAFT INTRAVEHICULAR ENVIRONMENTS 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerospace industry 38066 NASA Thesaurus 100 100 100 100 100 add aerospace medicine space medicine 60572 NASA Thesaurus Definition Source Definition SP-7 1965 That branch of medicine dealing with the effects of flight through the atmosphere or in space upon the human body and with the prevention or cure of physiological or psychological malfunctions arising from these effects. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerospace planes 38068 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerospace safety 60573 NASA Thesaurus Definition Source Definition 1982 The engineering assessment and analysis of systems, subsystems, and functions of spacecraft, missiles, advanced aircraft and ground support in order to identify hazards associated with such systems and to design procedures that eliminate those hazards or determine tolerable safety levels. 100 100 100 100 100 100 100 100 100 add ~ aerospace sciences space sciences 38070 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerospace systems 38071 NASA Thesaurus 100 100 100 100 100 add aerospace technology transfer 60574 NASA Thesaurus Definition Source Definition 1977 Technology transfer germane to aircraft and space vehicles, their propulsion, guidance, etc. 100 100 100 100 100 100 add aerospace vehicles 60575 NASA Thesaurus Definition Source Definition SP-7 1968 Vehicles capable of flight within and outside the sensible atmosphere. 100 100 100 100 100 100 100 add aerospike engines 64383 NASA Thesaurus Definition Source Definition NASA Rocket engines incorporating a radial in-flow (aerospike) nozzle for altitude compensation. Since the nozzle is open to the ambient atmosphere, the plume compensates for decreasing atmospheric pressure as the vehicle ascends. 100 100 100 100 100 100 100 100 100 add aerostatics 38074 NASA Thesaurus 100 100 100 100 100 100 add aerostats 182221 NASA Thesaurus 100 add aerothermochemistry 38075 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerothermodynamics 60576 NASA Thesaurus Definition Source Definition SP-7 1968 The study of aerodynamic phenomena at sufficiently high gas velocities that thermodynamic properties of the gas are important. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aerothermoelasticity 60577 NASA Thesaurus Definition Source Definition SP-7 1968 The study of the response of elastic structures to the combined effects of aerodynamic heating and loading. 100 100 add aerozine 60578 NASA Thesaurus Definition Source Definition 1968 A rocket fuel consisting of a mixture of hydrazine and unsymmetrical dimethylhydrazine (UDMH). 100 100 100 add AFC (control) 182222 NASA Thesaurus 100 add AFCS (control system) 182223 NASA Thesaurus 100 add affects 182224 NASA Thesaurus 100 add afferent nervous systems 38079 NASA Thesaurus 100 100 100 add affinity 38080 NASA Thesaurus 100 100 100 100 100 add Afghanistan 38081 NASA Thesaurus 100 100 add AFM (microscopy) 182225 NASA Thesaurus 100 add Africa 38082 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add African rift system 38083 NASA Thesaurus 100 100 100 add afterbodies cylindrical afterbodies sterns 60579 NASA Thesaurus Definition Source Definition SP-7 1968 Companion bodies that trail satellites. Sections or pieces of rockets or spacecraft that enter the atmosphere unprotected behind nose cones or other bodies that are protected for entry. Afterparts of vehicles. Used for cylindrical afterbodies and sterns. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add afterburners 182226 NASA Thesaurus 100 add afterburning afterburners 60580 NASA Thesaurus Definition Source Definition SP-7 1968 Irregular burning of fuel left in the firing chamber of a rocket after cutoff. The function of an afterburner, a device for augmenting the thrust of a jet engine by burning additional fuel in the uncombined oxygen in the gases from the turbine. Used for afterburners. 100 100 100 100 100 100 100 100 100 add afterglows 60581 NASA Thesaurus Definition Source Definition SP-7 1968 Broad, high arches of radiance or glow seen occasionally in the western sky above the highest clouds in deepening twilight, caused by the scattering effect of very fine particles of dust suspended in the upper atmosphere. Also, the transient decay of a plasma after the power has been turned off. 100 100 100 100 100 100 100 100 100 100 add afterimages 38087 NASA Thesaurus 100 100 100 100 100 100 add AGB stars 182227 NASA Thesaurus 100 add AGC (control) 182228 NASA Thesaurus 100 add age determination 182229 NASA Thesaurus 100 add age factor 38088 NASA Thesaurus 100 100 100 add age hardening 182230 NASA Thesaurus 100 add Agena A rocket vehicle 38089 NASA Thesaurus 100 100 100 add Agena B Ranger Program 38090 NASA Thesaurus 100 100 add Agena B rocket vehicle 38091 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add Agena C rocket vehicle 38092 NASA Thesaurus 100 add Agena D rocket vehicle 38093 NASA Thesaurus 100 add Agena rocket vehicles 38094 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add ~ agents 38095 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 100 100 100 add agglomeration 38096 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add agglutination 38097 NASA Thesaurus 100 100 100 100 100 100 100 add aggregates 38098 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add ~ aging 38099 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 add aging (biology) 38100 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add aging (materials) 38101 NASA Thesaurus 100 100 100 100 100 100 100 add aging (metallurgy) 38102 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add agitation 38103 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add agreements 38104 NASA Thesaurus 100 100 100 100 add agricultural aircraft Snow aerial applicator aircraft S-2B Snow S-2 aircraft 60582 NASA Thesaurus Definition Source Definition 1979 Light aircraft specially equipped for agricultural applications such as crop dusting. 100 100 100 100 100 100 100 100 100 add agriculture 38106 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add AgRISTARS project Crop Inventories by Remote Sensing 60583 NASA Thesaurus Definition Source Definition 1980 A multiagency program utilizing Landsat remote sensing data to predict crop yields, land use, and detect pollution. Used for Crop Inventories by Remote Sensing. 100 100 100 100 100 100 100 100 100 100 100 100 100 add agroclimatology 38108 NASA Thesaurus 100 100 100 100 100 100 100 add agrometeorology 38109 NASA Thesaurus 100 100 100 100 100 100 100 add agrophysical units 60584 NASA Thesaurus Definition Source Definition 1983 Geographic areas defined for statistical purposes by AgRISTARS personnel whose boundaries are based on natural rather than political lines for the purpose of comparing similar agricultural regions. 100 100 100 100 add AGT 182231 NASA Thesaurus 100 add AH-1G helicopter 60585 NASA Thesaurus Definition Source Definition 1980 US Army designation for the Bell Model 209 Hueycobra attack helicopter powered by a single Avco Lycoming T53-L-13 turboshaft engine. 100 100 100 add AH-1S helicopter 55503 NASA Thesaurus 100 100 100 100 100 add AH-1W helicopter SuperCobra 55504 NASA Thesaurus 100 100 100 100 100 100 add AH-63 helicopter 38112 NASA Thesaurus 100 100 100 100 add AH-64 helicopter 38113 NASA Thesaurus 100 100 100 100 add ~ aids 38114 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 add AIDS (disease) 182232 NASA Thesaurus 100 add ailerons 38115 NASA Thesaurus 100 100 100 100 100 100 100 100 add AIMP-1 182233 NASA Thesaurus 100 add AIMP-2 182234 NASA Thesaurus 100 add AIMP-D 182235 NASA Thesaurus 100 add AIMP-E 182236 NASA Thesaurus 100 add air 60586 NASA Thesaurus Definition Source Definition SP-7 1968 The mixture of gases comprising the Earth's atmosphere. 100 100 100 100 100 100 100 100 100 100 100 100 add air bag restraint devices 38117 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add air bearings 182237 NASA Thesaurus 100 add air blasts 182238 NASA Thesaurus 100 add air breathing boosters 60587 NASA Thesaurus Definition Source Definition 1981 Boosters which are possible substitutes for rocket engines and which have inlets for oxygen sources for their engines rather than carrying their own oxygen as in a conventional rocket. 100 100 100 100 add air breathing engines 38119 NASA Thesaurus 100 100 100 100 100 add air cargo air freight 38120 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add air conditioning 60588 NASA Thesaurus Definition Source Definition ASTM (E 41, G-3) 1968 The simultaneous control of all, or at least three, of those factors affecting both the physical and chemical conditions of the atmosphere within any structure. These factors include temperature, humidity, motion, distribution, dust, bacteria, odor, and toxic gases. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air conditioning equipment 38122 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air conductivity 38123 NASA Thesaurus 100 100 100 add air cooling 38124 NASA Thesaurus Scope Note COOLING WITH AIR 100 100 100 100 100 100 100 add air currents 38125 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air cushion landing systems 60589 NASA Thesaurus Definition Source Definition 1977 Landing systems based on the ground effect principle whereby a stratum of air is utilized as the aircraft ground contacting medium (in place of landing gear). 100 100 100 100 100 add air cushion vehicles 182239 NASA Thesaurus 100 add air data systems 60590 NASA Thesaurus Scope Note Definition Source Definition LIMITED TO FLIGHT DATA SYSTEMS IEEE 1975 Sets of aerodynamic and thermodynamic sensors, and a computer which provide flight characteristics such as airspeed, static pressure, air temperature and Mach number. 100 100 100 100 100 100 add air defense 38128 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Air Density Explorer A 182240 NASA Thesaurus 100 add Air Density/Injun Explorer B 182241 NASA Thesaurus 100 add air drop operations 38129 NASA Thesaurus 100 100 100 100 100 100 100 100 add air ducts 38130 NASA Thesaurus 100 100 100 100 100 100 100 add air filters 38131 NASA Thesaurus 100 100 100 100 100 100 100 add air flow 38132 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add air freight 182242 NASA Thesaurus 100 add air inlets 182243 NASA Thesaurus 100 add air intakes air inlets 38133 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air jets 38134 NASA Thesaurus 100 100 100 100 100 100 100 add air land interactions 38135 NASA Thesaurus 100 100 100 100 100 100 100 add air launching 38136 NASA Thesaurus 100 100 100 100 100 add air law 60591 NASA Thesaurus Definition Source Definition 1980 The body of domestic and/or international laws dealing with regulations and liabilities in civil or military aviation. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air locks 60592 NASA Thesaurus Definition Source Definition SP-7 1968 A stoppage or diminution of flow in a fuel system, hydraulic system, or the like, caused by pockets of air or vapor. Also chambers capable of being hermetically sealed that provide for passage between two places of different pressure as between an altitude chamber and the outside atmosphere. 100 100 100 100 100 100 100 100 100 100 add air mail 38139 NASA Thesaurus 100 add air masses 60593 NASA Thesaurus Definition Source Definition AGI 1968 Large widespread volumes of air having particular characteristics of temperature and moisture content that were acquired at its source region and are modified as they move away from their source. 100 100 100 100 100 100 100 100 100 100 add air navigation 60594 NASA Thesaurus Definition Source Definition NASA The art, science, or action of plotting and directing the course of an aircraft through the air from one place to another. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air piracy hijacking 38142 NASA Thesaurus 100 100 100 100 100 100 100 100 add air pollution atmospheric impurities 60595 NASA Thesaurus Definition Source Definition ASTM (D 1356, D-22) 1968 The presence of unwanted material in the air. The term "unwanted material" here refers to material in sufficient concentrations, present for a sufficient time, and under circumstances to interfere significantly with comfort, health, or welfare of persons, or with the full use and enjoyment of property. Used for atmospheric impurities. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air purification 38144 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add air quality 38145 NASA Thesaurus 100 100 100 100 100 100 100 100 add air sampling 38146 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add air sea ice interactions 38147 NASA Thesaurus 100 100 100 100 add air sea interactions 182244 NASA Thesaurus 100 add air showers 182245 NASA Thesaurus 100 add air sickness 182246 NASA Thesaurus 100 add air slew missiles 60596 NASA Thesaurus Definition Source Definition 1977 Solid propellant rockets utilizing thrust vector control. 100 100 100 100 100 add air start engine relight (in-flight) in-flight starting 38149 NASA Thesaurus 100 100 100 100 100 100 100 add air to air missiles air to air rockets 38150 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add air to air refueling 38151 NASA Thesaurus 100 100 add air to air rockets 182247 NASA Thesaurus 100 add air to surface missiles 38152 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air traffic 38153 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add air traffic control 60597 NASA Thesaurus Definition Source Definition FAA 1988 A service operated by approriate authority to promote the safe, orderly and expedious flow of air traffic. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add air traffic controllers (personnel) 38155 NASA Thesaurus 100 100 100 100 100 add air transportation 60598 NASA Thesaurus Definition Source Definition NASA The conveyance of cargo and passengers by means of airplanes, helicopters, and other airborne vehicles. 100 100 100 100 100 100 100 100 100 100 100 100 add air water interactions air sea interactions 38157 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add airborne equipment 38158 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add airborne infection 38159 NASA Thesaurus 100 100 100 add Airborne Integrated Reconnaissance System AIRS (reconnaissance sys) 60599 NASA Thesaurus Definition Source Definition 1977 Aerial reconnaissance system incorporating various modes of detection. Used for AIRS (reconnaissance sys). 100 100 100 100 100 100 add airborne lasers 38161 NASA Thesaurus 100 100 100 100 100 100 add airborne radar 38162 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add airborne radar approach 60600 NASA Thesaurus Definition Source Definition 1980 The use of airborne radar for helicopter approach control -- the radar cursor technique. 100 100 100 100 100 100 100 add airborne range and orbit determination AROD (range-orbit determination) 38164 NASA Thesaurus 100 100 100 100 100 add airborne/spaceborne computers flight computers onboard computers spacecraft computers 38166 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add airborne surveillance radar 38165 NASA Thesaurus 100 100 100 100 100 add Airborne Warning and Control System 182248 NASA Thesaurus 100 add Airbus 182249 NASA Thesaurus 100 add ~ aircraft aerodynamic vehicles 38167 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft accident investigation 38168 NASA Thesaurus 100 100 100 100 add aircraft accidents 38169 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft antennas 38170 NASA Thesaurus 100 100 100 100 100 100 100 100 add aircraft approach spacing 38171 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft bases 182250 NASA Thesaurus 100 add aircraft brakes 38172 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft cabins 182251 NASA Thesaurus 100 add aircraft carriers 38173 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add aircraft communication 60601 NASA Thesaurus Definition Source Definition NASA The conveyance of information to or from aircraft by radio or other signals. 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft compartments aircraft cabins aircraft interiors 38175 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add aircraft configurations fixed-wing aircraft 38176 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft construction 182252 NASA Thesaurus 100 add aircraft construction materials 60602 NASA Thesaurus Definition Source Definition 1976 A general term designating the materials used in manufacturing an aircraft. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft control flap control 60603 NASA Thesaurus Definition Source Definition SP-7 To direct the movements of an aircraft with particular reference to changes in attitude and speed. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft design 60604 NASA Thesaurus Definition Source Definition NASA The act of conceiving and planning the structure, systems, and performance characteristics of an aircraft vehicle or any other apparatus, machine or contrivance intended to be borne up either by dynamic action of the air upon the object`s surfaces, or by the object`s own buoyancy. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft detection 38180 NASA Thesaurus 100 100 100 100 100 100 100 add Aircraft Energy Efficiency program 182253 NASA Thesaurus 100 add aircraft engines aircraft power sources 38181 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft equipment 38182 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft fuel systems 38183 NASA Thesaurus 100 100 100 100 100 100 100 add aircraft fuels 38184 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft guidance 38185 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft hangars 182254 NASA Thesaurus 100 add aircraft hazards 38186 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft hydraulic systems 38187 NASA Thesaurus 100 100 100 100 100 100 100 add aircraft icing wing icing 60605 NASA Thesaurus Definition Source Definition 1991 Accumulation of ice on aircraft external surfaces, propellers and engine inlets from freezing rain or flight through inclement weather. 100 100 100 100 100 100 100 100 100 100 100 add aircraft industry 38189 NASA Thesaurus 100 100 100 100 add aircraft instruments 60606 NASA Thesaurus Definition Source Definition NASA Any electronic or mechanically-based instrument or instrument system designed for detecting, measuring, displaying, recording, telemetering, processing, or analyzing different values or quantities encountered in the flight of an aircraft; often supporting the general control of the aircraft. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft interiors 182255 NASA Thesaurus 100 add aircraft landing 38191 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft launching devices takeoff systems 38192 NASA Thesaurus 100 100 100 100 add aircraft lights 38193 NASA Thesaurus 100 100 100 100 add aircraft maintenance 38194 NASA Thesaurus 100 100 100 100 100 100 100 add aircraft maneuvers 38195 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft models 38196 NASA Thesaurus 100 100 100 100 100 100 100 100 add aircraft noise 38197 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft noise prediction 182256 NASA Thesaurus 100 add aircraft parts 38198 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft performance 60607 NASA Thesaurus Definition Source Definition NASA The manner or effectiveness with which an aircraft vehicle or any airborne structure, machine, or contrivance functions while in operation. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft pilots aviators copilots jet pilots 38200 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add aircraft power sources 182257 NASA Thesaurus 100 add aircraft power supplies 60608 NASA Thesaurus Definition Source Definition NASA Electric power sources for the normal operation of aircraft. 100 100 100 100 100 add aircraft production fuselage mounting 38202 NASA Thesaurus 100 100 100 100 100 100 100 add aircraft production costs 38203 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft reliability airworthiness airworthiness requirements 38204 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft runup 60609 NASA Thesaurus Definition Source Definition 1980 Final engine check prior to takeoff. 100 100 100 100 100 100 add aircraft safety 60610 NASA Thesaurus Definition Source Definition NASA Techniques used to prevent aircraft failures or accidents; the degree to which an aircraft is free of the risk of malfunction or accidents. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft specifications 38207 NASA Thesaurus 100 100 100 100 100 100 100 100 add aircraft spin 60611 NASA Thesaurus Definition Source Definition 1979 A prolonged stall in fixed-wing aircraft characterized by a sustained spiral descent, usually with the nose down. 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft stability 60612 NASA Thesaurus Definition Source Definition NASA The property of an aircraft to maintain its attitude or to resist displacement, and if displaced, to develop forces and moments tending to restore the original condition. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft structures aircraft construction 38210 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft survivability 38211 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aircraft tires 38212 NASA Thesaurus 100 100 100 100 100 add aircraft wakes 38213 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add aircrews 182258 NASA Thesaurus 100 add airdrops 38214 NASA Thesaurus 100 100 100 100 100 100 add airfield surface movements 38215 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add airfields 182259 NASA Thesaurus 100 add airfoil characteristics 182260 NASA Thesaurus 100 add airfoil fences 38216 NASA Thesaurus 100 100 100 100 100 add airfoil oscillations 60613 NASA Thesaurus Definition Source Definition 1987 Periodic motions experienced by airfoils in aerodynamic conditions. 100 100 100 100 100 100 100 100 100 100 100 100 100 add airfoil profiles aerodynamic chords airfoil sections airfoil thickness Clark Y airfoil 38218 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add airfoil sections 182261 NASA Thesaurus 100 add airfoil thickness 182262 NASA Thesaurus 100 add airfoils airfoil characteristics 60614 NASA Thesaurus Definition Source Definition SP-7 1968 Structures, pieces, or bodies, originally likened to foils or leaves in being wide and thin, designed to obtain a useful reaction on themselves in their motion through the air. Used for airfoil characteristics. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add airframe materials 38220 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add airframes 60615 NASA Thesaurus Definition Source Definition SP-7 1968 The assembled structural and aerodynamic components of an aircraft or rocket vehicle that support the different systems and subsystems integral to the vehicle. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Airgeep aircraft 182263 NASA Thesaurus 100 add airglow atmospheric emission 60616 NASA Thesaurus Definition Source Definition SP-7 1968 The quasi-steady radiant emission from the upper atmosphere as distinguished from the sporadic emission of the auroras. Used for atmospheric emission. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add airline operations 38223 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add airlock modules 60617 NASA Thesaurus Definition Source Definition SP-7 Modular chambers capable of being hermetically sealed that provide for passage between two places of different pressure as between an altitude chamber and the outside atmosphere. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add airport beacons 38225 NASA Thesaurus 100 100 100 100 100 add airport lights 38226 NASA Thesaurus 100 100 100 100 add airport planning 38227 NASA Thesaurus 100 100 100 100 100 add airport security 60618 NASA Thesaurus Definition Source Definition 1977 Organization of trained security personnel, surveillance and screening devices, and procedures used for the protection of airport and airline property, aircraft, passengers, employees, and visitors from injury, air piracy, and other unauthorized acts. 100 100 100 100 100 100 100 100 add airport surface detection equipment ASDE 38229 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add airport towers 38230 NASA Thesaurus 100 100 100 100 100 100 100 100 add airports airfields 60619 NASA Thesaurus Definition Source Definition FAA 1988 An area of land or water that is used, or intended to be used, for the landing and takoff of aircraft, including buildings and facilities, if any. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add AIRS (reconnaissance sys) 182264 NASA Thesaurus 100 add airships aerostats dirigibles 60620 NASA Thesaurus Definition Source Definition DOE 1968 Propelled and steerable dirigibles dependent on gases for flotation. Used for aerostats and dirigibles. 100 100 100 100 100 100 100 100 add airspace 60621 NASA Thesaurus Definition Source Definition SP-7 1968 The atmosphere above a particular portion of the earth, usually defined by the boundaries of an area on the surface projected perpendicularly upward. 100 100 100 100 100 100 100 100 100 add airspeed 38234 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add airworthiness 182265 NASA Thesaurus 100 add airworthiness requirements 182266 NASA Thesaurus 100 add Airy function 38235 NASA Thesaurus 100 100 100 100 100 100 100 100 add Aitken nuclei 60622 NASA Thesaurus Definition Source Definition 1978 Microscopic particles in the atmosphere which serve as condensation nuclei for droplet growth during the rapid adiabatic expansion produced by an Aitken dust counter. 100 100 100 100 100 100 100 100 100 100 100 100 100 add AJ-10 engine 38237 NASA Thesaurus 100 100 100 add AJ-1000 engine 182267 NASA Thesaurus 100 add Akebono satellite 182268 NASA Thesaurus 100 add akermanite 60623 NASA Thesaurus Definition Source Definition AGI 1980 A mineral of the melilite group. It is isomorphous with gehlenite. 100 100 100 100 100 100 100 add Alabama 38239 NASA Thesaurus 100 100 100 add Aladin 2 aircraft 38240 NASA Thesaurus 100 100 100 add Alais meteorite 38241 NASA Thesaurus 100 add alanine 38242 NASA Thesaurus 100 100 100 100 add alarms 182269 NASA Thesaurus 100 add Alaska 38243 NASA Thesaurus 100 100 100 100 100 100 100 100 add Albania 38244 NASA Thesaurus 100 100 add albedo 60624 NASA Thesaurus Definition Source Definition SP-7 1968 The ratio of the amount of electromagnetic radiation reflected by a body to the amount incident upon it. It is often expressed as a percentage, as, the albedo of the Earth is 34 percent. 100 100 100 100 100 100 100 100 100 100 100 100 add Alberta 38246 NASA Thesaurus 100 add albinism 38247 NASA Thesaurus 100 100 100 add albumins 38248 NASA Thesaurus 100 100 add alcoholates 182270 NASA Thesaurus 100 add alcohols 38249 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aldehydes 60625 NASA Thesaurus Definition Source Definition ASTM (D 1695, D-23) 1968 Carbonyl groups to which a hydrogen atom is attached; the first stage of an alcohol; - CHO. 100 100 100 100 100 100 100 100 add aldolase 38251 NASA Thesaurus 100 100 add aldosterone 38252 NASA Thesaurus 100 100 100 add alertness 38253 NASA Thesaurus 100 100 100 100 add Aleutian Islands (US) 38254 NASA Thesaurus 100 100 100 100 100 add alexandrite 60626 NASA Thesaurus Definition Source Definition AGI 1992 A transparent variety of chrysoberl that has a grass-green or emerald green color in daylight and wine-red to brownish-red color by transmitted or incandescent artificial light. 100 100 100 100 add alfalfa 38256 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Alfven waves 182271 NASA Thesaurus 100 add AlGaAs 182272 NASA Thesaurus 100 add algae algal bloom diatoms (unicellular plants) 60627 NASA Thesaurus Definition Source Definition SP-7 1968 Any plants of a group of unicellular and multicellular primitive organisms that include the Chlorella, Scenedesmus, and other genera. Used for algal bloom. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add algal bloom 182273 NASA Thesaurus 100 add algebra 38258 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Algeria 38259 NASA Thesaurus 100 100 add ALGOL algorithmic oriented language 38260 NASA Thesaurus 100 100 100 100 add Algol engine 38261 NASA Thesaurus 100 100 100 100 100 add algorithmic oriented language 182274 NASA Thesaurus 100 add algorithms 60628 NASA Thesaurus Definition Source Definition SP-7 1968 Special mathematical procedures for solving a particular type of problem. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add alignment 38263 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ~ aliphatic compounds 38264 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 add aliphatic hydrocarbons 38265 NASA Thesaurus 100 100 100 100 100 100 100 100 add alkali halides 38266 NASA Thesaurus 100 100 100 100 100 100 100 add ~ alkali metal compounds Group 1A compounds 38267 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 add alkali metals 60629 NASA Thesaurus Definition Source Definition SP-7 1968 Metals in group IA of the periodic system; namely, lithium, sodium, potassium, rubidium, cesium, and francium. 100 100 100 100 100 100 100 100 100 100 100 add alkali vapor lamps 60630 NASA Thesaurus Definition Source Definition 1977 Lamps in which light is produced by an electric discharge between electrodes in an alkali vapor at low or high pressures. 100 100 100 100 100 add alkalies caustics 38270 NASA Thesaurus 100 100 100 100 100 100 100 100 add alkaline batteries 38271 NASA Thesaurus 100 100 100 add ~ alkaline earth compounds Group 2A compounds 38272 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 add alkaline earth metals 38273 NASA Thesaurus 100 100 100 100 add alkaline earth oxides 38274 NASA Thesaurus 100 100 100 100 100 100 add alkalinity 60631 NASA Thesaurus Definition Source Definition 1981 The state of being alkaline. 100 100 100 100 100 100 100 100 100 add alkaloids 38276 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add alkalosis 38277 NASA Thesaurus 100 100 100 100 100 add alkanes saturated hydrocarbons 38278 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add alkenes olefins 38279 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add alkoxides alcoholates 38280 NASA Thesaurus 100 100 100 100 100 add alkyd resins 38281 NASA Thesaurus 100 100 100 add alkyl compounds 38282 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add alkylates 38283 NASA Thesaurus 100 100 add alkylation oxyalkylation 38284 NASA Thesaurus 100 100 100 100 100 100 add alkylferrocene 38285 NASA Thesaurus 100 add alkylidene 38286 NASA Thesaurus 100 add alkynes 38287 NASA Thesaurus 100 100 100 100 100 100 add all sky photography 38288 NASA Thesaurus 100 100 100 100 100 add all-weather air navigation 38289 NASA Thesaurus 100 100 100 100 100 100 100 100 add all-weather landing systems 38290 NASA Thesaurus 100 100 100 100 100 100 add Allegheny Plateau (US) 38291 NASA Thesaurus 100 100 100 100 100 100 add Allende meteorite 38292 NASA Thesaurus 100 add allergic diseases 38293 NASA Thesaurus 100 100 100 add allocations assignment 38294 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add allotropy 38295 NASA Thesaurus 100 100 100 add allowances 38296 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add alloxan 38297 NASA Thesaurus 100 100 100 100 100 add alloying 38298 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add alloys 60632 NASA Thesaurus Definition Source Definition SP-7 1968 Substances having metallic properties and being composed of two or more chemical elements of which at least one is an elemental metal. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add alluvium 60633 NASA Thesaurus Definition Source Definition ASTM (D 653, D-18) 1973 Soil, the constituents of which have been transported in suspension by flowing water and subsequently deposited by sedimentation. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add allyl compounds 38301 NASA Thesaurus 100 100 add almucantar 182275 NASA Thesaurus 100 add Aloha system 60634 NASA Thesaurus Definition Source Definition 1981 A multiple random access communications scheme in which there is a nonfixed allocation of channel capacity, so that the channel is available to any terminal whenever it has a packet ready for transmission. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Alouette 1 satellite S-27 satellite 38307 NASA Thesaurus 100 100 100 add Alouette 2 satellite 38308 NASA Thesaurus 100 100 100 add Alouette 3 helicopter 182276 NASA Thesaurus 100 add Alouette B satellite 38303 NASA Thesaurus 100 100 add Alouette helicopters 38304 NASA Thesaurus 100 100 100 100 100 add Alouette project 38305 NASA Thesaurus 100 100 100 100 100 100 add Alouette satellites 38306 NASA Thesaurus 100 100 100 100 100 100 add alpha decay 60635 NASA Thesaurus Definition Source Definition SP-7 1968 The radioactive transformation of a nuclide by alpha-particle emission. 100 100 100 add Alpha jet aircraft 38310 NASA Thesaurus 100 100 100 100 100 add Alpha Magnetic Spectrometer AMS (spectrometer) 55607 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add alpha particles alpha radiation 60636 NASA Thesaurus Scope Note Definition Source Definition EMITTED BY NUCLEI SP-7 1968 Positively charged particles emitted from the nuclei of certain atoms during radioactive disintegration. Used for alpha radiation. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add alpha plasma devices 38312 NASA Thesaurus 100 100 100 100 100 100 add alpha radiation 182277 NASA Thesaurus 100 add alphabets 38313 NASA Thesaurus 100 100 100 100 100 add alphanumeric characters 60637 NASA Thesaurus Definition Source Definition IEEE 1968 Characters in a set that contain both letters and digits, but they usually also contain other characters such as punctuation symbols. 100 100 100 100 100 100 add alphatrons 38315 NASA Thesaurus 100 100 add Alpine meteorology 60638 NASA Thesaurus Definition Source Definition 1979 Wind, precipitation, atmospheric physics, and other climatological phenomena peculiar to the Alps and/or other similar mountainous areas. 100 100 100 100 100 100 100 100 add Alps Mountains (Europe) 38317 NASA Thesaurus 100 100 100 100 100 100 add ALS (launch system) 182278 NASA Thesaurus 100 add ALSEP 182279 NASA Thesaurus 100 add Altair engine 182280 NASA Thesaurus 100 add Altair Lunar Lander 64821 NASA Thesaurus Definition Source Definition NASA The lunar landing module of the Constellation program. The lander is capable of landing four astronauts on the moon, providing life support and a base for weeklong initial surface exploration missions, and returning the crew to the Orion spacecraft that will return them to Earth. 100 100 100 100 100 100 100 100 add alteration 182281 NASA Thesaurus 100 add alternating current AC (current) 38318 NASA Thesaurus 100 100 100 100 100 100 100 100 add alternating current generators 182282 NASA Thesaurus 100 add alternating direction implicit methods ADI methods 38319 NASA Thesaurus 100 100 100 100 100 add alternations 38320 NASA Thesaurus 100 100 100 100 add alternatives 38321 NASA Thesaurus 100 100 100 add alternators (generators) 182283 NASA Thesaurus 100 add altimeters 60639 NASA Thesaurus Definition Source Definition SP-7 1968 Instruments for measuring height above a reference datum. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add altimetry 38323 NASA Thesaurus 100 100 100 100 100 100 100 100 add altitude 60640 NASA Thesaurus Definition Source Definition SP-7 1968 In astronomy, angular displacement above the horizon. Also height, especially radial distance as measured above a given datum, as average sea level. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add altitude acclimatization 60641 NASA Thesaurus Definition Source Definition SP-7 1968 A physiological adaptation to reduced atmospheric and oxygen pressure. 100 100 add altitude control 38326 NASA Thesaurus 100 100 100 100 100 add altitude sickness 60642 NASA Thesaurus Definition Source Definition SP-7 1968 In general, any sickness brought on by exposure to reduced oxygen tension and barometric pressure. 100 100 100 100 100 add altitude simulation simulated altitude 38328 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add altitude tests 38329 NASA Thesaurus 100 100 100 100 100 100 100 add altitude tolerance 38330 NASA Thesaurus 100 100 100 100 100 100 add ALU (computer components) 182284 NASA Thesaurus 100 add alum 38331 NASA Thesaurus 100 100 100 add alumina 182285 NASA Thesaurus 100 add aluminates 38332 NASA Thesaurus 100 100 100 100 add aluminides 60643 NASA Thesaurus Definition Source Definition 1987 Intermetallic compounds of aluminum and a transition metal. 100 100 100 100 100 100 100 100 100 100 100 add aluminizing 182286 NASA Thesaurus 100 add aluminum 38334 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add aluminum 26 38354 NASA Thesaurus 100 add aluminum 27 38355 NASA Thesaurus 100 add aluminum alloys 38335 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aluminum antimonides 38336 NASA Thesaurus 100 100 add aluminum arsenides 60644 NASA Thesaurus Definition Source Definition 1978 Binary compounds of aluminum with negative, trivalent arsenic. 100 100 100 100 100 add aluminum borohydrides 38338 NASA Thesaurus 100 100 100 add aluminum boron composites 60645 NASA Thesaurus Definition Source Definition 1976 Structural materials composed of aluminum alloys reinforced with boron fibers (filaments). 100 100 100 100 add aluminum carbides 38340 NASA Thesaurus 100 100 add aluminum chlorides 38341 NASA Thesaurus 100 100 100 add aluminum coatings aluminizing 38342 NASA Thesaurus 100 100 100 add aluminum compounds 38343 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aluminum fluorides 38344 NASA Thesaurus 100 100 add aluminum gallium arsenide lasers 38345 NASA Thesaurus 100 100 100 100 100 add aluminum gallium arsenides AlGaAs 60646 NASA Thesaurus Definition Source Definition 1978 Compounds exhibiting characteristics suitable for use in laser devices, light-emitting diodes, solar cells, etc. Used for AlGaAs. 100 100 100 100 100 add aluminum graphite composites 60647 NASA Thesaurus Definition Source Definition 1976 Structural materials composed of aluminum alloys reinforced with graphite. 100 100 100 add aluminum hydrides 38348 NASA Thesaurus 100 100 100 add aluminum isotopes 38349 NASA Thesaurus 100 100 100 100 add aluminum-lithium alloys 60648 NASA Thesaurus Definition Source Definition 1976 Light alloys consisting primarily of aluminum and lithium. 100 100 100 100 100 100 100 100 add aluminum nitrides 38350 NASA Thesaurus 100 100 add aluminum oxides alumina corundum 38351 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aluminum perchlorates 38352 NASA Thesaurus 100 100 add aluminum silicates 38353 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add alveolar air 60649 NASA Thesaurus Definition Source Definition SP-7 1968 The respiratory air in the alveoli (air sacs) deep within the lungs. 100 100 100 100 add alveoli 60650 NASA Thesaurus Definition Source Definition SP-7 1968 The terminal air sacs deep within the lungs. 100 100 100 100 100 add AM-1 (EOS) spacecraft 182288 NASA Thesaurus 100 add AM (modulation) 182287 NASA Thesaurus 100 add amalgams 182289 NASA Thesaurus 100 add Amalthea 60651 NASA Thesaurus Definition Source Definition 1978 Innermost satellite of Jupiter. 100 100 100 add Amazon region (South America) 38360 NASA Thesaurus 100 100 100 100 100 add Amberlite (trademark) 38361 NASA Thesaurus 100 100 add ambience 38362 NASA Thesaurus 100 100 100 100 100 add ambient temperature environmental temperature 60652 NASA Thesaurus Definition Source Definition DOE 1968 Temperature of surrounding medium. Used for environmental temperature. 100 100 100 100 100 100 add ambiguity 38364 NASA Thesaurus 100 100 add ambipolar diffusion 38365 NASA Thesaurus 100 100 100 100 100 100 add ambit 182290 NASA Thesaurus 100 add ambulances 38366 NASA Thesaurus 100 100 100 add American Indians 38367 NASA Thesaurus 100 100 100 100 100 add americium 38368 NASA Thesaurus 100 100 add americium 241 38370 NASA Thesaurus 100 add americium isotopes 38369 NASA Thesaurus 100 100 add amidase 38371 NASA Thesaurus 100 100 add amides 38372 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add amines 38373 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add amino acids 38374 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add amino radical 38375 NASA Thesaurus 100 100 100 100 100 100 100 add aminophylline 38376 NASA Thesaurus 100 100 100 100 add ammeters 60653 NASA Thesaurus Definition Source Definition IEEE An instrument for measuring the magnitude of an electric current. 100 100 100 100 100 100 100 100 add ammines 38378 NASA Thesaurus 100 100 100 100 100 add ammonia 38379 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ammonium bromides 38380 NASA Thesaurus 100 100 add ammonium chlorides 38381 NASA Thesaurus 100 100 add ammonium compounds 38382 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add ammonium nitrates 38383 NASA Thesaurus 100 100 100 100 add ammonium perchlorates 38384 NASA Thesaurus 100 100 100 add ammonium phosphates 38385 NASA Thesaurus 100 100 add ammonium picrates 38386 NASA Thesaurus 100 100 100 add ammonium sulfates 38387 NASA Thesaurus 100 100 add ammonolysis 38388 NASA Thesaurus 100 100 100 100 100 add ammunition 38389 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add amobarbital 38390 NASA Thesaurus 100 100 add amoeba 38391 NASA Thesaurus 100 100 100 add AMOOS 182291 NASA Thesaurus 100 add Amor asteroid Minor Planet 1221 60654 NASA Thesaurus Definition Source Definition 1978 One group of Earth-approaching asteroids with orbits between the planets Mars and Jupiter. Used for Minor Planet 1221. 100 100 100 100 100 100 100 100 add amorphous materials 38393 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add amorphous semiconductors 38394 NASA Thesaurus 100 100 100 add amorphous silicon 38395 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add amount quantity 38396 NASA Thesaurus 100 100 100 100 add AMP (biochemistry) 182292 NASA Thesaurus 100 add amperage 182293 NASA Thesaurus 100 add amphetamines 38397 NASA Thesaurus 100 100 100 add amphibia 38398 NASA Thesaurus 100 100 100 add amphibious aircraft 38399 NASA Thesaurus 100 100 100 100 add amphibious vehicles 38400 NASA Thesaurus 100 100 100 100 100 100 100 100 add amphiboles 60655 NASA Thesaurus Definition Source Definition DOE 1968 A group of dark, rock-forming, ferromagnesian silicate minerals closely related in crystal form and composition. 100 100 100 add Amphitrite asteroid 38402 NASA Thesaurus 100 100 100 add amplidynes 38403 NASA Thesaurus 100 100 100 100 100 add amplification amplification factor gain (amplification) intensification 38404 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add amplification factor 182294 NASA Thesaurus 100 add amplifier design 38405 NASA Thesaurus 100 100 100 100 100 100 100 add amplifiers electronic amplifiers 60656 NASA Thesaurus Definition Source Definition SP-7 1968 Devices which enable an input signal to control a source of power whose output is an enlarged reproduction of the essential characteristics of the signal. Used for electronic amplifiers. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add amplitrons (trademark) 182295 NASA Thesaurus 100 add amplitude distribution analysis amplitude probability analysis 38407 NASA Thesaurus 100 100 100 100 100 100 add amplitude modulation AM (modulation) 60657 NASA Thesaurus Definition Source Definition SP-7 1968 In general, modulation in which the amplitude of a wave is the characteristic subject to variation. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add amplitude probability analysis 182296 NASA Thesaurus 100 add amplitudes 60658 NASA Thesaurus Definition Source Definition SP-7 1968 The maximum value of the displacement of a wave or other periodic phenomenon from a reference position. Also, angular distance north or south of the prime vertical; the arc of the horizon, or the angle at the zenith between the prime vertical and a vertical circle, measured north or south from the prime vertical to the vertical circle. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ampoules 60659 NASA Thesaurus Definition Source Definition ASTM (C 162, C-14) 1968 Glass containers designed to be filled and sealed by fusion of the glass neck. 100 100 100 add AMPS (satellite payload) Atmospheric and Magnetospheric Payload plasmas-in-space payload 38411 NASA Thesaurus 100 100 100 100 100 add AMPTE (satellites) Active Magneto Particle Tracer Explorers 38412 NASA Thesaurus Scope Note ACTIVE MAGNETOSPHERIC PARTICLE TRACER EXPLORERS 100 100 100 100 100 100 100 100 add AMS (spectrometer) 182297 NASA Thesaurus 100 add AMSU (radiometer) 182298 NASA Thesaurus 100 add AMTV 182299 NASA Thesaurus 100 add AN-2 aircraft 38413 NASA Thesaurus 100 100 100 100 100 add AN-22 aircraft Antheus aircraft Antonov AN-22 aircraft Cock aircraft 38414 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add AN-24 aircraft Antonov AN-24 aircraft Coke aircraft 38415 NASA Thesaurus 100 100 100 100 100 100 100 100 add anabaena 38416 NASA Thesaurus 100 add anaerobes 38417 NASA Thesaurus 100 100 100 100 add analgesia 38418 NASA Thesaurus 100 100 100 add analog circuits 38419 NASA Thesaurus 100 100 100 100 add analog computers 60660 NASA Thesaurus Definition Source Definition SP-7 1968 Computers that work on the principle of measuring, as distinguished from counting, in which the input data is analogous to a measurement continuum such as linear lengths, voltages, or resistances which can be manipulated by the computer. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add analog data 38421 NASA Thesaurus 100 100 100 100 100 100 100 100 add analog simulation 38422 NASA Thesaurus 100 100 100 100 100 100 100 add analog to digital converters digitizers 60661 NASA Thesaurus Definition Source Definition DOE 1968 Devices for converting non-digital information into digits. Used for digitizers. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add analogies similarities 38424 NASA Thesaurus 100 100 100 100 100 100 add analogs 38425 NASA Thesaurus 100 100 add analysis 182300 NASA Thesaurus 100 add analysis (mathematics) 60662 NASA Thesaurus Definition Source Definition 1968 That part of the field of mathematics which arises from the calculus and which deals primarily with functions. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add analysis of variance 60663 NASA Thesaurus Definition Source Definition ASTM (D 3980, D-1) 1971 A systematic statistical procedure for determining the sources and the magnitudes of the errors present in a measurement process, and for assessing the significance of differences between materials, processes, or test methods under study. 100 100 add analytic functions holomorphism 38428 NASA Thesaurus 100 100 100 100 100 100 100 100 add analytic geometry 38429 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add analytical chemistry 38430 NASA Thesaurus 100 100 100 100 100 100 add analyzers 38431 NASA Thesaurus Scope Note EXCLUDES DEVICES FOR PERFORMING MATHEMATICAL ANALYSIS 100 100 100 100 100 100 100 100 add ~ analyzing analysis instrumental analysis 38432 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add anaphylaxis 38433 NASA Thesaurus 100 100 100 100 100 add anastigmatism 38434 NASA Thesaurus 100 100 add anatase octahedrite 38435 NASA Thesaurus 100 100 100 100 100 add anatomy 38436 NASA Thesaurus Scope Note LIMITED TO ANIMAL ANATOMY 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add anchors (fasteners) 38437 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Andes Mountains (South America) 38438 NASA Thesaurus 100 100 add andesite 60664 NASA Thesaurus Definition Source Definition DOE 1968 Volcanic rock composed essentially of andesine and one or more mafic constituents. 100 100 100 100 100 100 add Andorra 38440 NASA Thesaurus 100 100 100 100 100 add ~ Andromeda 38441 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 add Andromeda Constellation 38442 NASA Thesaurus 100 100 100 add Andromeda Galaxy 38443 NASA Thesaurus 100 100 100 100 add anechoic chambers 60665 NASA Thesaurus Definition Source Definition IEEE 1968 Enclosures especially designed with boundaries that absorb sufficiently well the sound incident thereon to create an essentially field-free condition in the frequency ranges of interest. 100 100 100 100 100 100 100 add anelasticity 38445 NASA Thesaurus 100 100 100 100 100 add anemias 38446 NASA Thesaurus 100 100 100 100 100 100 100 100 add anemometers 60666 NASA Thesaurus Definition Source Definition 1988 Instruments used to measure the speed of air currents, usually measured from the rotation of wind drivin cups or from wind pressure through a tube pointed into the wind. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add anemometry 182301 NASA Thesaurus 100 add anesthesia 38448 NASA Thesaurus 100 100 100 100 100 add anesthesiology 38449 NASA Thesaurus 100 100 100 100 100 100 100 add anesthetics 38450 NASA Thesaurus 100 100 100 100 100 100 add angels (radar) 60667 NASA Thesaurus Definition Source Definition IEEE 1968 Echos of false radar targets caused by atmospheric inhomogeneity, atmospheric refraction, insects, birds, or unknown phenomena. 100 100 100 100 add angina pectoris 38452 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add angiogenesis neovascularization 64675 NASA Thesaurus Definition Source Definition NASA The development of new blood vessels. 100 100 100 100 100 100 add angiography 38453 NASA Thesaurus 100 100 100 100 add angiosperms 38454 NASA Thesaurus 100 100 100 100 add angiotensins 64746 NASA Thesaurus Definition Source Definition MESH Oligopeptides ranging in size from angiotensin precursors with 14 amino acids to the active vasoconstrictor angiotensin II with 8 amino acids, or their analogs or derivatives. The amino acid content varies with the species and changes in that content produce antagonistic or inactive compounds. 100 100 100 100 100 add angle of attack 60668 NASA Thesaurus Definition Source Definition SP-7 1968 The angle between a reference line fixed with respect to an airframe and a line in the direction of movement of the body. 100 100 100 100 100 100 100 100 100 add angles (geometry) 60669 NASA Thesaurus Definition Source Definition SP-7 1968 The inclination to each other of two intersecting lines, measured by the arc of a circle intercepted between the two lines forming the angle, the center of the circle being the point of intersection. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Angola 38457 NASA Thesaurus 100 100 add angular acceleration 60670 NASA Thesaurus Definition Source Definition SP-7 1968 The rate of change of angular velocity. 100 100 100 100 100 100 100 100 100 100 add angular correlation 38459 NASA Thesaurus 100 100 100 100 add angular distribution 38460 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add angular momentum 38461 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add angular motion 182302 NASA Thesaurus 100 add angular resolution 60671 NASA Thesaurus Definition Source Definition SP-7 1968 Specifically, the ability of a radar to distinguish between two targets solely by the measurement of angles. 100 100 100 100 100 100 add angular velocity angular motion 60672 NASA Thesaurus Definition Source Definition SP-7 1968 The change of angle per unit time; specifically, in celestial mechanics, the change in angle of the radius vector per unit time. Used for angular motion. 100 100 100 100 100 100 100 100 100 100 100 100 add anhydrides 38464 NASA Thesaurus 100 100 100 100 add Anik 1 Anik A Telesat Canada A 38466 NASA Thesaurus 100 100 100 100 100 100 100 add Anik 2 Anik B Telesat Canada B 38467 NASA Thesaurus 100 100 100 100 100 100 100 add Anik 3 Anik C Telesat Canada 3 Telesat Canada C 38468 NASA Thesaurus 100 100 100 100 100 100 100 add Anik A 182303 NASA Thesaurus 100 add Anik B 182304 NASA Thesaurus 100 add Anik C 182305 NASA Thesaurus 100 add Anik satellites 60673 NASA Thesaurus Definition Source Definition 1983 A series of geostationary communication satellites operated by Telesat which is partly owned by the Canadian government and partly owned by private enterprise. The name "Anik" is derived from an Eskimo word meaning "brother." It was so designated because of its partial use in the Far North. 100 100 100 100 100 100 100 100 add aniline 38469 NASA Thesaurus 100 100 add animal models 64816 NASA Thesaurus Definition Source Definition MeSH Non-human animals, selected because of specific characteristics, for use in experimental research, teaching, or testing. 100 100 100 100 100 100 100 100 100 100 100 add animals fauna metazoa 38470 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add animation 38471 NASA Thesaurus 100 100 100 100 add anions 38472 NASA Thesaurus 100 100 100 100 100 100 100 100 add anisole 38473 NASA Thesaurus 100 100 add anisoplanatism 64433 NASA Thesaurus Definition Source Definition NASA In adaptive optics (AO) systems, a performance-degrading effect that arises whenever light from the wave-front sensor beacon and light from the target object sample different volumes of optical turbulence. This effect results in an increased value of the aperture-averaged residual phase variance after AO compensation, which causes an exponential decrease in system performance. 100 100 100 100 100 100 100 100 add anisotropic fluids 38474 NASA Thesaurus 100 100 100 100 100 100 100 add anisotropic media 38475 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add anisotropic plates nonisotropic plates 38476 NASA Thesaurus 100 100 100 100 100 100 add anisotropic shells 38477 NASA Thesaurus 100 100 100 100 add anisotropy nonisotropy onisotropy photothermotropism thermotropism 60674 NASA Thesaurus Definition Source Definition ASTM (D 653, D-18) 1968 Having different properties in different directions. Used for nonisotropy, onisotropy, photothermotropism, and thermotropism. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Anna hurricane 38479 NASA Thesaurus 100 add ANNA satellites 38480 NASA Thesaurus 100 100 100 100 100 100 add annealing 60675 NASA Thesaurus Definition Source Definition SP-7 1968 Application of heat energy to a material cooling at a suitable rate to relieve stresses, change certain properties, improve machinability, or for realignment of atoms in a distorted lattice as caused, for example, by radiation damage. 100 100 100 100 100 100 100 100 100 100 100 100 100 add annihilation reactions 38482 NASA Thesaurus 100 100 100 100 100 100 100 100 add annotations 38483 NASA Thesaurus 100 100 100 add annual variations interannual variations seasonal variations 38484 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add annular core pulse reactors 38485 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add annular ducts 60676 NASA Thesaurus Definition Source Definition 1979 Ring-shaped openings for the passage of fluids (gases, etc.) designed for optimum aerodynamic flow properties for the application involved. 100 100 100 100 100 100 100 100 100 100 add annular flow 38487 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add annular nozzles 38488 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add annular plates 38489 NASA Thesaurus 100 100 100 100 add annular suspension and pointing system 60677 NASA Thesaurus Definition Source Definition 1980 In the Shuttle era, high accuracy pointing and stabilization of an experiment payload. 100 100 100 100 100 100 100 100 add annuli 38491 NASA Thesaurus 100 100 100 100 100 100 add anodes 60678 NASA Thesaurus Definition Source Definition SP-7 1968 The positive poles or electrodes of electron emitters, such as electron tubes or electric cells. 100 100 100 100 100 100 100 100 100 add anodic coatings 38493 NASA Thesaurus 100 100 100 100 100 100 add anodic stripping 60679 NASA Thesaurus Definition Source Definition 1980 The removal of metal coatings. 100 100 100 100 100 100 100 100 add anodizing 60680 NASA Thesaurus Definition Source Definition ASTM (B 374, B-8) 1968 An electrolytic oxidation process in which the surface of a metal, when anodic, is converted to a coating having desirable protective, decorative, or functional properties. 100 100 100 100 100 100 add anolytes 38496 NASA Thesaurus 100 100 100 add anomalies 60681 NASA Thesaurus Definition Source Definition SP-7 1968 In general, deviations from the norm. 100 100 100 100 100 add anomalous temperature zones 38498 NASA Thesaurus 100 100 100 100 100 100 100 add anorthosite 60682 NASA Thesaurus Definition Source Definition DOE 1968 A group of essentially monomineralic plutonic igneous rocks composed almost entirely of plagioclass feldspar. 100 100 100 100 add anoxia 60683 NASA Thesaurus Definition Source Definition SP-7 1968 A complete lack of oxygen available for physiological use within the body. 100 100 100 100 add ANS 182306 NASA Thesaurus 100 add Antarctic environment 182307 NASA Thesaurus 100 add Antarctic Ocean 38501 NASA Thesaurus 100 100 add Antarctic regions Antarctica 60684 NASA Thesaurus Definition Source Definition 1968 The areas surrounding and including the continent of Antarctica. Used for Antarctica. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Antarctica 182308 NASA Thesaurus 100 add Antares rocket vehicle 38503 NASA Thesaurus 100 100 100 100 100 add Antelope missile 38504 NASA Thesaurus 100 add antenna arrays 60685 NASA Thesaurus Definition Source Definition SP-7 1968 Systems of antennas coupled together to obtain directional effects, or to increase sensitivity. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antenna components 38506 NASA Thesaurus 100 100 100 100 100 100 100 100 add antenna couplers 38507 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add antenna design 38508 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antenna feeds 38509 NASA Thesaurus 100 100 100 100 100 100 add antenna fields 182309 NASA Thesaurus 100 add antenna gain 55600 NASA Thesaurus 100 100 100 100 100 100 100 add antenna radiation patterns antenna fields 38510 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antennas 60686 NASA Thesaurus Definition Source Definition SP-7 1968 Conductors or systems of conductors for radiating or receiving radio waves. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Antheus aircraft 182310 NASA Thesaurus 100 add anthracene 38512 NASA Thesaurus 100 100 100 add anthracite hard coal 60687 NASA Thesaurus Definition Source Definition AGI 1973 Coal of the highest metamorphic rank, in which fixed-carbon content is between 92 percent and 98 percent (on a dry, mineral-matter-free basis). It is hard and black, and has a semimetallic luster and semiconchoidal fracture. Anthracite ignites with difficulty and burns with a short blue flame, without smoke. Used for hard coal. 100 100 100 100 add anthraquinones 38514 NASA Thesaurus 100 100 100 add anthropology 60688 NASA Thesaurus Definition Source Definition DOE 1968 The study of the interrelations of biological, cultural, geographical, and historical aspects of man. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add anthropometry 38516 NASA Thesaurus 100 100 100 100 100 add antiadrenergics 38517 NASA Thesaurus 100 100 add antiaircraft missiles 38518 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antibiotics 38519 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add antibodies 38520 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add anticholinergics cholinergic blocking agents 38521 NASA Thesaurus 100 100 100 add anticlines anticlinoria 60689 NASA Thesaurus Definition Source Definition DOE 1974 Geologic formations characterized by folds, the core of which contain stratigraphically older rocks; they convex upward. Used for anticlinoria. 100 100 100 100 100 100 100 100 add anticlinoria 182311 NASA Thesaurus 100 add anticoagulants 38523 NASA Thesaurus 100 100 100 100 100 add anticoincidence detectors anticoincidence shields 64499 NASA Thesaurus Definition Source Definition NASA Detectors and related systems that differentiate ambient background noise from signals of interest by identifying unwanted input signals that co-occur in time with other signals. Often used with gamma-ray detection systems. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add anticoincidence shields 182312 NASA Thesaurus 100 add anticonvulsants 38524 NASA Thesaurus 100 100 add anticyclones 38525 NASA Thesaurus 100 100 100 100 100 100 add antidetection technology 182313 NASA Thesaurus 100 add antidiuretics 38526 NASA Thesaurus 100 100 add antidotes 38527 NASA Thesaurus 100 100 add antiemetics and antinauseants 38528 NASA Thesaurus 100 100 add antiferroelectricity 38529 NASA Thesaurus 100 100 100 100 100 add antiferromagnetism 38530 NASA Thesaurus 100 100 100 100 100 100 100 100 add antifouling 60690 NASA Thesaurus Definition Source Definition 1981 Measures taken to prevent corrosion or the accumulation of organic or other residues or growths on operating machanisms, especially in underwater environments. 100 100 100 100 100 100 100 add antifreezes 38532 NASA Thesaurus 100 100 100 add antifriction bearings 38533 NASA Thesaurus 100 100 100 100 100 100 100 100 add antigens 38534 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add antigravity 60691 NASA Thesaurus Definition Source Definition SP-7 1968 A hypothetical effect that would arise from cancellation by some energy field of the effect of the gravitational field of the earth or other body. 100 100 add Antigua and Barbuda 38536 NASA Thesaurus 100 100 100 add antihistaminics 38537 NASA Thesaurus 100 100 100 100 100 100 add antihypertensive agents 38538 NASA Thesaurus 100 100 add antiicing additives 38539 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add antiinfectives and antibacterials 38540 NASA Thesaurus 100 100 100 100 100 100 add antiknock additives 38541 NASA Thesaurus 100 100 100 100 100 100 add antimatter 38542 NASA Thesaurus 100 100 100 100 100 100 add antimissile defense 38543 NASA Thesaurus Scope Note PROTECTION AGAINST MISSILE ATTACK 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antimissile missiles 38544 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antimisting fuels 60692 NASA Thesaurus Definition Source Definition 1985 Fuels which have an additive to reduce misting and thus create safer fuels. 100 100 100 100 100 100 add antimonides 38546 NASA Thesaurus 100 100 100 100 100 100 100 100 add antimony 38547 NASA Thesaurus 100 100 add antimony alloys 38548 NASA Thesaurus 100 100 100 100 add antimony compounds 38549 NASA Thesaurus 100 100 100 100 100 add antimony fluorides 38550 NASA Thesaurus 100 100 add antimony isotopes 38551 NASA Thesaurus 100 100 100 add antineutrinos 38552 NASA Thesaurus 100 100 100 100 add antinodes 60693 NASA Thesaurus Definition Source Definition SP-7 1968 Either of the two points on an orbit where a line in the orbit plane, perpendicular to the line of nodes and passing through the focus intersects the orbit. Also a point, line, or surface in a standing wave where some characteristic of the wave field has maximum amplitude. 100 100 100 100 100 100 add antinucleons 38554 NASA Thesaurus 100 100 add antioxidants 60694 NASA Thesaurus Definition Source Definition ASTM (D 1566, D-11) 1968 Compounding ingredients used to retard deterioration caused by oxidation. 100 100 100 100 100 100 100 100 100 100 add antiparticles 60695 NASA Thesaurus Definition Source Definition SP-7 1968 Particles with a charge of opposite signs to the same particles in normal matter. 100 100 100 100 100 100 100 100 100 100 100 100 add antiphase boundaries antiphase domains APB (materials) 55585 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antiphase domains 182314 NASA Thesaurus 100 add antipodes 60696 NASA Thesaurus Definition Source Definition SP-7 1968 Anything exactly opposite to something else. Particularly, that point on the Earth 180 deg. from a given place. 100 100 100 100 100 add antiprotons 38558 NASA Thesaurus 100 100 100 100 add antiquities 60697 NASA Thesaurus Definition Source Definition 1985 Man-made objects or surviving parts or fragments from the past. 100 100 100 add antiradar coatings 38560 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add antiradiation drugs radioprotective agents 38561 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add antiradiation missiles 60698 NASA Thesaurus Definition Source Definition 1980 Missiles that attack radiating targets such as radar transmitters, etc. 100 100 100 100 100 100 100 100 add antireflection coatings 60699 NASA Thesaurus Definition Source Definition IEEE 1973 Thin dielectric or metallic films applied to an optical surface to reduce the reflectance and thereby increase the transmittance. Note: The ideal value of the reactive index of a single layered film is the square root of the product of the refractive indices on either side of the film, the ideal optical thickness being one quarter of a wavelength. 100 100 100 100 100 100 add antiseptics disinfectants 38564 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add antiserums 38565 NASA Thesaurus 100 100 100 100 add antiship missiles 38566 NASA Thesaurus 100 100 100 100 100 100 add antiship warfare 38567 NASA Thesaurus 100 100 100 100 100 100 100 add antisite defects 64380 NASA Thesaurus Definition Source Definition NASA Point defects occurring in crystalline compounds where an atom of one atomic species occupies an atomic site that is allocated to a different atomic species (e.g., in GaAs, an arsenic atom may sit on a site allocated to a gallium atom). If the nearest neighbor sites are occupied with the correct species for their sites (e.g., an arsenic antisite atom surrounded by arsenic atoms), the antisite atom is then bonded to four like atoms (rather than four Ga atoms). Such a configuration is not electrically neutral, but acts as a double donor. An "antisite pair" occurs if two adjacent atoms have simply been interchanged. 100 100 100 100 100 100 add antiskid devices 38568 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add antistatic devices 182315 NASA Thesaurus 100 add antisubmarine warfare 38569 NASA Thesaurus 100 100 100 100 100 100 100 100 add antisubmarine warfare aircraft 38570 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add antisymmetry 38571 NASA Thesaurus 100 100 100 add antitank missiles 38572 NASA Thesaurus 100 100 100 add Antonov aircraft 38573 NASA Thesaurus 100 100 100 100 add Antonov AN-22 aircraft 182316 NASA Thesaurus 100 add Antonov AN-24 aircraft 182317 NASA Thesaurus 100 add anvil clouds 38574 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add anvils 38575 NASA Thesaurus 100 100 add anxiety 60700 NASA Thesaurus Definition Source Definition NASA CASI Nervous or fear reaction to a perception of danger. 100 100 100 100 100 100 add AO-1 aircraft 182318 NASA Thesaurus 100 add AOIPS 182319 NASA Thesaurus 100 add aorta 38577 NASA Thesaurus 100 100 add AOSO Advanced Orbiting Solar Observatory 38578 NASA Thesaurus 100 100 100 add Apache rocket vehicle 38579 NASA Thesaurus 100 100 add apatites 182320 NASA Thesaurus 100 100 add APB (materials) 182321 NASA Thesaurus 100 add aperiodic functions 38580 NASA Thesaurus 100 100 100 100 add apertures 38581 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add apes 38582 NASA Thesaurus 100 100 add apexes vertices 38583 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add aphelions 38584 NASA Thesaurus 100 100 100 100 100 100 add API (computers) 182322 NASA Thesaurus 100 add APL (programming language) 60701 NASA Thesaurus Definition Source Definition 1983 "A Programming Language" is a high level interactive computer language primarily designed for mathematical applications. It was developed by Kenneth Iverson in 1962. It is characterized by extensive operators and array handling capability. NASA Goddard was one of the first users and was instrumental in introducing APL to the computer community. 100 100 add apnea 182323 NASA Thesaurus 100 add apodization 64627 NASA Thesaurus Definition Source Definition NASA The elimination or smoothing of sharp discontinuities in an image, electrical signal, or mathematical function; as in the modification of lens design to reduce diffraction fringes, or the mathematical processing of interferograms to suppress sidelobes. 100 100 100 100 100 100 100 add apogee boost motors ABM apogee kick motors 38586 NASA Thesaurus 100 100 100 100 100 100 add apogee kick motors 182324 NASA Thesaurus 100 add apogees 60702 NASA Thesaurus Definition Source Definition IEEE 1968 Those orbital points farthest from the Earth, when the Earth is the center of attraction. 100 100 100 100 100 100 add Apollo 5 flight 38607 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 6 flight 38608 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 7 flight 38609 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 8 flight 38610 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 9 flight 38611 NASA Thesaurus 100 100 100 100 100 100 100 100 add Apollo 10 flight 38599 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 11 flight 38600 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 12 flight 38601 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 13 flight 38602 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 14 flight 38603 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 15 flight 38604 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add Apollo 16 flight 38605 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo 17 flight 38606 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Apollo applications program 38588 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add Apollo asteroids 60703 NASA Thesaurus Definition Source Definition 1978 Earth grazing asteroids in orbits between Mars and Jupiter, and crossing the Earth's orbit. This group contains 19 known asteroids. 100 100 100 100 100 100 100 100 100 add Apollo extension system 38590 NASA Thesaurus 100 100 100 100 100 100 100 add Apollo flights 38591 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Apollo lunar experiment module 38592 NASA Thesaurus 100 100 100 100 add Apollo Lunar Surface Experiments Package ALSEP 38593 NASA Thesaurus 100 100 100 100 100 100 100 add Apollo project 38594 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Apollo short stack 38595 NASA Thesaurus 100 add Apollo Soyuz test project ASTP 38596 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add Apollo spacecraft 38597 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Apollo telescope mount 38598 NASA Thesaurus 100 100 add apoptosis programmed cell death 64503 NASA Thesaurus Definition Source Definition NASA One of the two mechanisms by which cell death occurs (the other being the pathological process of NECROSIS). Apoptosis is the mechanism responsible for the physiological deletion of cells and appears to be intrinsically programmed. It is characterized by distinctive morphologic changes in the nucleus and cytoplasm, chromatin cleavage at regularly spaced sites, and the endonucleolytic cleavage of genomic DNA at internucleosomal sites. This mode of cell death serves as a balance to mitosis in regulating the size of animal tissues and in mediating pathologic processes associated with tumor growth. 100 100 100 100 100 100 100 100 100 add Appalachian Mountains (North America) 38612 NASA Thesaurus 100 100 add apparatus 182325 NASA Thesaurus 100 add appearance 38613 NASA Thesaurus 100 100 100 add appendages 38614 NASA Thesaurus 100 100 100 100 100 100 add appendix (anatomy) 38615 NASA Thesaurus 100 100 add application 182326 NASA Thesaurus 100 add application programming interface API (computers) 64652 NASA Thesaurus Definition Source Definition NASA An interface between a software or hardware system and an application program which allows the application program to communicate with, and to access services from the software or hardware system 100 100 add application specific integrated circuits ASIC custom integrated circuits 38616 NASA Thesaurus 100 100 100 100 100 100 100 add Applications Explorer Satellites 38617 NASA Thesaurus 100 100 add ~ applications of mathematics mathematical analysis 38618 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add applications programs (computers) 60704 NASA Thesaurus Definition Source Definition IEEE Software designed to fulfill specific needs of a user; for example, software for navigation, payroll, or process control. 100 100 100 100 100 100 add Applications Technology Satellites 182327 NASA Thesaurus 100 add approach 38620 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add approach and landing tests (STS) 60705 NASA Thesaurus Definition Source Definition 1978 A series of flight maneuvers involving the Space Shuttle. 100 100 100 100 100 100 100 100 100 add approach control 60706 NASA Thesaurus Definition Source Definition FAA 1988 The control process which delivers aircraft to the final approach course or landing system properly spaced for their landing. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add approach indicators 38623 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add appropriations 38624 NASA Thesaurus 100 100 100 100 add approximation approximation methods nominal values truncation (mathematics) 38625 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add approximation methods 182328 NASA Thesaurus 100 add apsidal angles 182329 NASA Thesaurus 100 add apsides apsidal angles 38626 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add APT (picture transmission) 182330 NASA Thesaurus 100 add aptitude 38627 NASA Thesaurus 100 100 100 add Aqua spacecraft EOS PM (satellite) 64759 NASA Thesaurus Definition Source Definition NASA Second in a series of EOS (Earth Observing System) spacecraft developed to advance the understanding of the ways that the Earth`s lands, oceans, air, ice, and life function as a total environmental system. Aqua studies the Earth`s water cycle, including evaporation from the oceans, water vapor in the atmosphere, clouds, precipitation, soil moisture, sea ice, land ice, and snow cover on the land and ice. The spacecraft carries six instruments: the Atmospheric Infrared Sounder (AIRS), the Advanced Microwave Sounding Unit (AMSU-A), the Humidity Sounder for Brazil (HSB), the Advanced Microwave Scanning Radiometer for EOS (AMSR-E), the Moderate Resolution Imaging Spectroradiometer (MODIS), and Clouds and the Earth`s Radiant Energy System (CERES). 100 100 100 100 100 100 100 100 100 100 100 100 add Aquarid meteoroids 38628 NASA Thesaurus 100 100 100 add aquatic plants 60707 NASA Thesaurus Definition Source Definition 1981 Plants growing in or on water. 100 100 100 100 100 add aqueous solutions 38630 NASA Thesaurus 100 100 100 add aquiculture 60708 NASA Thesaurus Definition Source Definition 1977 The cultivation (breeding, raising, and harvesting) of fish, mollusks, shellfish, and/or other aquatic life as sources of food. 100 100 100 100 100 100 100 100 100 100 100 add aquifers 60709 NASA Thesaurus Definition Source Definition DOE 1974 Bodies of rock that contain sufficient saturated permeable material to conduct ground water and to yield economically significant quantities of ground water to wells and springs. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Arabian commercial satellite 182331 NASA Thesaurus 100 add Arabian Sea 38633 NASA Thesaurus 100 100 add Arabsat 38634 NASA Thesaurus 100 100 100 add aragonite 60710 NASA Thesaurus Definition Source Definition DOE 1968 A white, yellowish, or gray orthorhombic mineral, that contains calcium carbonate. 100 100 100 100 add aramid fiber composites 38636 NASA Thesaurus Scope Note ARAMID FIBER UTILIZATION IN COMPOSITES. FOR PROPERTIES OF ARAMID FIBERS THEMSELVES USE 'ARAMID FIBERS'. 100 100 100 100 100 100 100 100 100 add aramid fibers 38637 NASA Thesaurus Scope Note PROPERTIES OF ARAMID FIBERS THEMSELVES. FOR ARAMID FIBER UTILIZATION IN COMPOSITES USE 'ARAMID FIBER COMPOSITES'. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add arc chambers 38638 NASA Thesaurus 100 100 100 100 add arc clouds 38639 NASA Thesaurus 100 100 100 100 100 100 100 100 add arc discharges 38640 NASA Thesaurus 100 100 add arc generators 38641 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add arc heating Gerdien arc heaters 38642 NASA Thesaurus 100 100 100 100 100 100 100 add arc jet engines 60711 NASA Thesaurus Definition Source Definition NASA Electrothermal rocket engines that produce thrust by expanding a hot gas in an appropriate nozzle to a high velocity. The propellant is heated to a higher temperature than can be obtained through combustion processes resulting in higher exhaust velocities and better propellant efficiency. 100 100 100 100 100 100 100 add arc lamps 38644 NASA Thesaurus 100 100 100 100 100 100 add arc melting 38645 NASA Thesaurus 100 100 100 100 100 add arc spraying plasma arc spraying 38646 NASA Thesaurus 100 100 100 add arc welding 38647 NASA Thesaurus 100 100 100 100 100 100 100 100 add Arcas rocket vehicles 38648 NASA Thesaurus 100 100 100 100 100 add archaebacteria 60712 NASA Thesaurus Definition Source Definition 1987 Organisms belonging to the taxonomic kingdom of the same name which are characterized by distinct t- and r-RNAs, the absence of peptoglycan cell walls and their possible replacement by a proteinaceous coat, ether-linked lipids from phytanyl chains, and occurrence in unusually harsh habitats, e.g., methane, halide and thermoacidic environments. These hardy bacteria are significant in the study of the origin of life. 100 100 100 100 100 add archaeology 38650 NASA Thesaurus 100 100 100 100 100 add archaeomagnetism 182332 NASA Thesaurus 100 add arches 38651 NASA Thesaurus 100 100 100 100 add archipelagoes 60713 NASA Thesaurus Definition Source Definition AGI 1973 Seas or areas in seas that contain numerous islands; also the island groups themselves. 100 100 100 100 100 100 add architecture 38653 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add architecture (computers) computer architecture 60714 NASA Thesaurus Definition Source Definition 1976 The design of system and logic organization and information flow relationships in a computer rather than the circuit and component features. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Arcomsat Arabian commercial satellite 38655 NASA Thesaurus 100 100 100 100 100 100 100 add Arcon rocket vehicle 38656 NASA Thesaurus 100 100 add ~ arcs 38657 NASA Thesaurus Scope Note (USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 add Arctic environments 182333 NASA Thesaurus 100 add Arctic Ocean 38658 NASA Thesaurus 100 100 100 100 100 100 add Arctic regions 38659 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add area 38660 NASA Thesaurus 100 100 100 100 100 100 100 add area navigation 60715 NASA Thesaurus Definition Source Definition FAA 1988 A method of navigation that permits aircraft operation on any desired course within the coverage of station-referenced navigation signals or within the limits of self-contained system capability. 100 100 100 add Arend-Roland comet 38662 NASA Thesaurus 100 100 add Ares 1 first stage 64787 NASA Thesaurus Definition Source Definition NASA A single, five-segment reusable solid rocket booster derived from the Space Shuttle Program's reusable solid rocket motor. 100 100 add Ares 1 launch vehicle 64786 NASA Thesaurus Definition Source Definition NASA An in-line, two-stage rocket configuration topped by the Orion crew exploration vehicle, a service module, and a launch abort system. 100 100 100 100 100 100 100 add Ares 1 upper stage 64788 NASA Thesaurus Definition Source Definition NASA Second stage of the Ares 1 launch vehicle incorporating a J-2X liquid oxygen/hydrogen main engine. 100 100 100 100 add Ares 5 cargo launch vehicle 64789 NASA Thesaurus Definition Source Definition NASA A two-stage heavy-lift launch vehicle comprised of a first stage having two five-segment reusable rocket boosters and a single liquid-fueled core propulsion booster; and an upper stage (Earth Departure Stage) propelled by a J-2X main engine. 100 100 100 100 100 100 100 add ARES (spacecraft) 182334 NASA Thesaurus 100 add Argentina 38663 NASA Thesaurus 100 100 100 add Argentine space program 38664 NASA Thesaurus 100 100 add Argo rocket vehicles 38665 NASA Thesaurus 100 100 100 100 100 100 100 add argon 38666 NASA Thesaurus 100 100 100 add argon isotopes 38667 NASA Thesaurus 100 100 add argon lasers 38668 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add argon-oxygen atmospheres 38670 NASA Thesaurus 100 100 100 100 100 100 100 add argon plasma 38669 NASA Thesaurus 100 100 100 100 add Argos system 38671 NASA Thesaurus 100 100 100 100 100 add Argosy MK-1 aircraft 38672 NASA Thesaurus 100 100 100 100 100 add arguments (mathematics) 182335 NASA Thesaurus 100 add Argus project 38673 NASA Thesaurus 100 100 add Ariane 4 launch vehicle 38675 NASA Thesaurus 100 100 100 add Ariane 5 launch vehicle 38676 NASA Thesaurus 100 100 100 100 add Ariane launch vehicle 38674 NASA Thesaurus 100 100 100 100 100 100 100 100 add arid lands 38677 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Ariel 60716 NASA Thesaurus Definition Source Definition SP-7 1986 A satellite of Uranus orbiting at a mean distance of 192,000 kilometers. 100 100 100 add Ariel 1 satellite S-51 satellite 38680 NASA Thesaurus 100 100 add Ariel 2 satellite S-52 satellite 38681 NASA Thesaurus 100 100 add Ariel 3 satellite 38682 NASA Thesaurus 100 add Ariel 4 satellite 38683 NASA Thesaurus 100 100 100 100 add Ariel 5 satellite 60717 NASA Thesaurus Definition Source Definition 1976 One in a series of artificial satellites launched for Britain by the United States. 100 100 add Ariel satellites 38679 NASA Thesaurus 100 100 100 100 100 100 100 100 add Aries constellation 38685 NASA Thesaurus 100 100 100 100 add Aries sounding rocket 60718 NASA Thesaurus Definition Source Definition 1982 The largest in terms of weight and volume of the sounding rockets. It has a 44 inch payload capacity. 100 add Arietid meteoroids 38687 NASA Thesaurus 100 100 add ARIP (impact prediction) 182336 NASA Thesaurus 100 100 add ARIS instrumentation ship 182337 NASA Thesaurus 100 add arithmetic 38688 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add arithmetic and logic units ALU (computer components) logic units 38689 NASA Thesaurus 100 100 100 100 100 100 add Arizona 38690 NASA Thesaurus 100 100 100 100 100 100 add Arkansas 38691 NASA Thesaurus 100 add arm (anatomy) 38692 NASA Thesaurus 100 100 100 100 100 100 100 100 add ARMA (mathematics) 182338 NASA Thesaurus 100 add armatures 38693 NASA Thesaurus 100 100 100 100 100 100 100 add armed forces 38694 NASA Thesaurus 100 100 100 100 100 100 100 100 add armed forces (foreign) 38695 NASA Thesaurus 100 100 100 100 100 100 100 add armed forces (United States) 38696 NASA Thesaurus 100 100 100 100 100 100 100 100 add Armenia 38697 NASA Thesaurus 100 100 100 add armor 38698 NASA Thesaurus 100 100 100 100 100 add arms (robotics) 182339 NASA Thesaurus 100 add Army-Navy instrumentation program 38699 NASA Thesaurus 100 100 100 add AROD (range-orbit determination) 182340 NASA Thesaurus 100 add ~ aromatic compounds aryl compounds 38700 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 add Aroos meteorite 38701 NASA Thesaurus 100 add arousal 38702 NASA Thesaurus 100 100 100 add ARPA computer network 60719 NASA Thesaurus Definition Source Definition 1977 The "Advanced Research Projects Agency" of the Department of Defense nationwide computer network incorporating digital communication between large numbers of dissimilar computers as well as direct access to programs, data, storage, etc. shared by all terminals. 100 100 100 100 100 100 100 100 add ARQ (communication) 182341 NASA Thesaurus 100 add arrays 38704 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ~ arresters 38705 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 add arresting gear 38706 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add arrhythmia 60720 NASA Thesaurus Definition Source Definition SP-7 1968 Absence of rhythm, as, for example, in heart beat. 100 add arrivals 38708 NASA Thesaurus 100 100 add arrow wings 60721 NASA Thesaurus Definition Source Definition SP-7 1968 Aircraft wings of V-shaped planform, either tapering or of constant chord, suggesting a stylized arrowhead. 100 100 100 100 add arroyos 38710 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add arsenates 38711 NASA Thesaurus 100 100 100 add arsenic 38712 NASA Thesaurus 100 100 100 add arsenic alloys 38713 NASA Thesaurus 100 100 add arsenic compounds 38714 NASA Thesaurus 100 100 100 100 add arsenic isotopes 38715 NASA Thesaurus 100 100 100 100 add arsenides 38716 NASA Thesaurus 100 100 100 100 100 100 100 add artemia 38717 NASA Thesaurus 100 add arteries 38718 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add arterioles 64711 NASA Thesaurus Definition Source Definition MESH The smallest divisions of the arteries located between the muscular arteries and the capillaries. 100 100 100 100 add arteriosclerosis atherosclerosis 38719 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add arthritis 38720 NASA Thesaurus 100 100 100 100 100 add arthropods 38721 NASA Thesaurus 100 100 100 100 100 100 100 add articulation (speech) 38722 NASA Thesaurus 100 100 100 add artifacts 38723 NASA Thesaurus 100 100 100 100 add artificial cardiac pacemaker 38724 NASA Thesaurus 100 100 100 100 100 100 100 100 add artificial clouds 38725 NASA Thesaurus 100 100 100 add artificial ears 38726 NASA Thesaurus 100 100 add artificial gravity 60722 NASA Thesaurus Definition Source Definition SP-7 1968 A simulated gravity established within a space vehicle by rotation or acceleration. 100 100 100 100 100 100 100 100 100 100 100 add artificial harbors 38728 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add artificial heart valves 38729 NASA Thesaurus 100 100 100 100 100 100 100 add artificial intelligence machine recognition 60723 NASA Thesaurus Definition Source Definition NASA A discipline concerned with the development of computer and extended-robotic systems that can exhibit intelligent action. May also be defined as a subfield of computer science concerned with concepts and methods of symbolic inference by a computer and the symbolic representation of the knowledge to be used in making inferences. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add artificial radiation belts 38731 NASA Thesaurus 100 100 100 100 100 add artificial respiration 182342 NASA Thesaurus 100 add artificial satellites 60724 NASA Thesaurus Definition Source Definition SP-7 1968 Man-made satellites. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add artillery 38733 NASA Thesaurus 100 100 100 100 100 100 100 100 add artillery fire 38734 NASA Thesaurus 100 100 add arts 38735 NASA Thesaurus 100 100 100 add Aryabhata 182343 NASA Thesaurus 100 add aryl compounds 182344 NASA Thesaurus 100 add ASA 182345 NASA Thesaurus 100 add asbestos 38736 NASA Thesaurus 100 100 100 100 100 100 100 add ascent 38737 NASA Thesaurus 100 100 100 100 100 add ascent propulsion systems 38738 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add ascent trajectories 38739 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ascorbic acid vitamin C 38740 NASA Thesaurus 100 100 100 100 add ascorbic acid metabolism 38741 NASA Thesaurus 100 100 add ASCR reactor 182346 NASA Thesaurus 100 add ASDE 182347 NASA Thesaurus 100 add ASE (aerodynamics) 182348 NASA Thesaurus 100 add ashes 38742 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add Asia 38743 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ASIC 182349 NASA Thesaurus 100 add aspartates 38744 NASA Thesaurus 100 100 100 100 add aspartic acid 38745 NASA Thesaurus 100 100 100 100 add aspect ratio slenderness ratio 60725 NASA Thesaurus Definition Source Definition SP-7 In general, the ratio of one dimension to another. In aeronautics, the ratio of the square of the span of an airfoil to the total airfoil area, or the ratio of its span to its mean chord. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Aspergillus 38747 NASA Thesaurus 100 100 100 add asphalt 60726 NASA Thesaurus Definition Source Definition ASTM (D 1079, D-8, D-4) 1968 A dark brown to black cementitious material, in which the predominating constituents are bitumens which occur in nature or are obtained in petroleum processing. 100 100 100 100 100 add asphaltenes 60727 NASA Thesaurus Definition Source Definition 1980 Components of bitumens that are soluble in carbon disulphide but not in paraffin naphtha, constitute the solid dispersed particles of the bitumens, and consist of high molecular weight hydrocarbons. 100 100 100 100 add aspheres 182350 NASA Thesaurus 100 add aspheric optics aspheres asymmetrical optics nonspherical optics 60728 NASA Thesaurus Definition Source Definition 1988 Lenses whose surfaces are custom tuned to specific applications, thereby correcting aberrations in an optical system. 100 100 100 100 100 100 100 100 100 add asphericity 38751 NASA Thesaurus 100 100 100 100 100 100 add asphyxia 38752 NASA Thesaurus 100 100 100 add aspiration 182351 NASA Thesaurus 100 add ASRM (STS) 182352 NASA Thesaurus 100 add ASROC engine 38753 NASA Thesaurus 100 100 100 add Assateague Island (MD-VA) 38754 NASA Thesaurus 100 100 100 100 add assaulting 182353 NASA Thesaurus 100 add assaying 38755 NASA Thesaurus 100 100 100 100 100 100 100 add assembler routines 38756 NASA Thesaurus 100 100 100 100 100 add assemblies 38757 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add assembling 38758 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ~ assembly 38759 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 add Assembly language 38760 NASA Thesaurus 100 100 100 100 100 100 100 100 add Assess program Spacelab simulation flights 38761 NASA Thesaurus 100 100 100 add assessments 38762 NASA Thesaurus 100 100 100 100 100 100 100 100 add ASSET gliders 38763 NASA Thesaurus 100 100 100 100 add ASSET project 38764 NASA Thesaurus 100 100 100 add assignment 182354 NASA Thesaurus 100 add assimilation 38765 NASA Thesaurus 100 100 100 100 add association reactions 60729 NASA Thesaurus Definition Source Definition 1980 Gas phase chemical processes in which two molecular species A and B react to form a larger molecule AB. In astrophysics these processes are involved in the "condensation" of small gaseous molecules into larger species. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add associations 182355 NASA Thesaurus 100 add associative memory associative storage content-addressable memory 64452 NASA Thesaurus Definition Source Definition NASA A method or device for data storage in which data is identified by a part or properties of its content, rather than by an address or relative position. 100 100 100 100 100 100 100 add associative processing (computers) 60730 NASA Thesaurus Definition Source Definition 1977 Byte-variable computer processing with multifield search, arithmetic, and logic capability. 100 100 100 100 100 100 100 add associative storage 182356 NASA Thesaurus 100 add assumptions 38768 NASA Thesaurus 100 100 100 100 100 add assurance 38769 NASA Thesaurus 100 100 100 100 add Assured Crew Return Vehicle ACRV 60731 NASA Thesaurus Definition Source Definition 1995 An aerospace vehicle designed to return space station crews to Earth quickly (less than 24 hours) in the event of crew illness/injury, space station catastrophe/failure, or transportation element catastrophe/failure. 100 100 100 100 100 100 100 100 100 100 100 100 add astatine 38771 NASA Thesaurus 100 100 add astatine isotopes 38772 NASA Thesaurus 100 100 add ASTEC solar turboelectric generator 38773 NASA Thesaurus 100 100 100 100 100 add asteroid belts 60732 NASA Thesaurus Definition Source Definition 1978 The location of the orbits of most of the minor planets (estimated at a half million asteroids) between Mars and Jupiter; about 2000 asteroids have been assigned numbers and names. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add asteroid capture 60733 NASA Thesaurus Definition Source Definition 1979 The transfer of an asteriod or comet from the influence of a planet into that of another planet or neutral satellite. 100 100 100 100 100 100 100 add asteroid collisions 55536 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add asteroid detection 55538 NASA Thesaurus 100 100 100 100 100 100 100 add asteroid missions 60734 NASA Thesaurus Definition Source Definition 1978 Space missions for the study of asteroids and related celestial bodies. 100 100 100 100 100 100 100 100 100 100 100 100 add asteroids minor planets 60735 NASA Thesaurus Definition Source Definition SP-7 1968 Small celestial bodies revolving around the sun, most having orbits between those of Mars and Jupiter. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add asteroseismology stellar seismology 64525 NASA Thesaurus Definition Source Definition NASA Study of stellar oscillations as a means to probing the internal structure and dynamics of stars. 100 100 100 100 100 100 100 100 100 100 100 add asthenopia 38778 NASA Thesaurus 100 100 add asthenosphere 60736 NASA Thesaurus Definition Source Definition AGI 1994 Layer or shell of the Earth below the lithosphere which is weak and in which isostatic adjustments take place, magmas may be generated, and seismic waves are strongly attenuated. 100 100 100 100 100 100 100 add asthma 38780 NASA Thesaurus 100 add astigmatism 60737 NASA Thesaurus Definition Source Definition NASA CASI A defect of an optical system in consequence of which rays from a point fail to meet in a focal point resulting in a blurred and imperfect image. 100 100 100 100 100 100 100 100 100 add ASTP 182357 NASA Thesaurus 100 add astrionics 60738 NASA Thesaurus Definition Source Definition NASA Astronautical electronics, particularly the development and use of electronic equipment and systems for space vehicles and platforms. 100 100 100 100 100 100 100 100 100 100 100 add Astro missions (STS) 38783 NASA Thesaurus 100 100 100 100 100 add Astro vehicle 38784 NASA Thesaurus Scope Note EXCLUDES STS 100 100 100 100 100 100 100 100 100 add Astrobee 1500 rocket vehicle 38786 NASA Thesaurus 100 100 add Astrobee rocket vehicles 38785 NASA Thesaurus 100 100 100 100 100 100 add astrobiology 182358 NASA Thesaurus 100 add astrodynamics 60739 NASA Thesaurus Definition Source Definition SP-7 1968 The practical application of celestial mechanics, astroballistics, propulsion theory, and allied fields to the problem of planning and directing the trajectories of space vehicles. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astrography 38788 NASA Thesaurus Scope Note EXCLUDES ASTRONOMICAL PHOTOGRAPHY 100 100 100 add Astroguide Navigation System 38789 NASA Thesaurus 100 100 100 100 100 add astrolabes 60740 NASA Thesaurus Definition Source Definition 1981 Instruments designed to observe the positions and measure the altitudes of celestial bodies. 100 100 100 100 100 100 100 100 100 100 100 100 add Astroloy (trademark) 38791 NASA Thesaurus 100 100 100 100 100 add astromasts 182359 NASA Thesaurus 100 add astrometry 38792 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Astron thermonuclear reactor 38793 NASA Thesaurus 100 100 100 100 add astronaut locomotion 38794 NASA Thesaurus 100 100 100 100 100 100 100 100 add astronaut maneuvering equipment 38795 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add astronaut performance 38796 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronaut training 38797 NASA Thesaurus 100 100 100 100 100 100 100 add ~ astronautics 60741 NASA Thesaurus Scope Note Definition Source Definition USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW NASA The science of space flight including the design, construction, and operation of spacecraft. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronauts 38799 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add astronavigation 38800 NASA Thesaurus 100 100 100 100 100 100 add astronomical catalogs star catalogs 38801 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add astronomical coordinates 60742 NASA Thesaurus Definition Source Definition SP-7 1968 Coordinates defining a point on the surface of the Earth, or of the geoid, in which the local direction of gravity is used as a reference. 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronomical interferometry 38803 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronomical maps 38804 NASA Thesaurus 100 100 100 100 100 100 100 add astronomical models orreries 38805 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Astronomical Netherlands Satellite ANS 38806 NASA Thesaurus 100 100 100 100 add astronomical observatories 38807 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronomical photography 38808 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronomical photometry 38809 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronomical polarimetry 60743 NASA Thesaurus Definition Source Definition 1991 The measurement of electromagnetic radiation from celestial bodies by polarimeters. 100 100 100 100 add astronomical satellites 38811 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronomical spectroscopy 38812 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astronomical telescopes 182360 NASA Thesaurus 100 add astronomy celestial observation 60744 NASA Thesaurus Definition Source Definition SP-7 1968 The science that treats of the location, magnitudes, motions, and constitution of celestial bodies and structures. Used for celestial observation. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add astrophysics geoastrophysics 60745 NASA Thesaurus Definition Source Definition NASA Study of the physical characteristics and processes associated with celestial bodies and interstellar space. The application of the laws of physics to the study of the celestial bodies and astronomical phenomena such as luminosity, size, mass, density, temperature, and chemical composition. Used for geoastrophysics. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Astroplane 38815 NASA Thesaurus Scope Note LIMITED TO THE EUROPEAN AIRBORNE ASTRONOMICAL OBSERVATORY 100 100 100 add asymmetrical optics 182361 NASA Thesaurus 100 add asymmetry dissymmetry 38816 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add asymptotes 38817 NASA Thesaurus 100 100 100 100 100 100 100 add asymptotic giant branch stars AGB stars 38818 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add asymptotic methods 38819 NASA Thesaurus 100 100 100 100 100 add asymptotic properties 60746 NASA Thesaurus Definition Source Definition 1984 Properties of any mathematical relation or corresponding physical system characterized by an approach to a given value as an expression, containing a variable, tends to infinity. 100 100 100 100 100 100 100 100 add asymptotic series 38821 NASA Thesaurus 100 100 100 100 add asynchronous motors 38822 NASA Thesaurus 100 100 100 add asynchronous transfer mode ATM (data transmission) 55493 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add ATARS 182362 NASA Thesaurus 100 add ataxia 38823 NASA Thesaurus 100 100 add ataxite 38824 NASA Thesaurus 100 100 100 add Atchafalaya River Basin (LA) 38825 NASA Thesaurus 100 100 100 add atelectasis 60747 NASA Thesaurus Definition Source Definition SP-7 1968 Collapsed or airless state of all or part of the lung. 100 100 add ATF 182363 NASA Thesaurus 100 add Athena rocket vehicle 38827 NASA Thesaurus 100 100 100 100 add atherosclerosis 182364 NASA Thesaurus 100 add athletes 38828 NASA Thesaurus 100 100 100 100 add athodyds 182365 NASA Thesaurus 100 add Atlanta (GA) 38829 NASA Thesaurus 100 100 add Atlantic aircraft 182366 NASA Thesaurus 100 add Atlantic Ocean 38830 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Atlantis (orbiter) Space Shuttle Orbiter 104 38831 NASA Thesaurus 100 100 100 100 100 100 100 add Atlas Able 5 launch vehicle 38832 NASA Thesaurus 100 100 100 add Atlas Agena B launch vehicle 38833 NASA Thesaurus 100 100 100 100 100 100 add Atlas Agena launch vehicles 38834 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add Atlas Centaur launch vehicle 38835 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Atlas D ICBM 38836 NASA Thesaurus 100 100 100 100 add Atlas E ICBM 38837 NASA Thesaurus 100 add Atlas F ICBM 38838 NASA Thesaurus 100 add Atlas ICBM 38839 NASA Thesaurus 100 100 100 100 100 100 add Atlas launch vehicles SM-65 missile 38840 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Atlas SLV-3 launch vehicle standard launch vehicle 3 38841 NASA Thesaurus 100 100 100 100 100 add ATLIT project Advanced Technology Light Twin aircraft 38842 NASA Thesaurus 100 100 100 100 100 100 add ATM (data transmission) 182367 NASA Thesaurus 100 add Atmosphere Explorer A 182368 NASA Thesaurus 100 add Atmosphere Explorer B 182369 NASA Thesaurus 100 add Atmosphere Explorer C 182370 NASA Thesaurus 100 add Atmosphere Explorer D 182371 NASA Thesaurus 100 add Atmosphere Explorer E 182372 NASA Thesaurus 100 add ~ atmospheres 60748 NASA Thesaurus Scope Note Definition Source Definition USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW NASA CASI (1) The mixture of gases surrounding the Earth or filling the habitable volume or a spacecraft. (2) The pressure exerted by a column of mercury 760 mm high at 1G, equal to 101.329 kilopascals. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric absorption 182373 NASA Thesaurus 100 add Atmospheric and Magnetospheric Payload 182374 NASA Thesaurus 100 add Atmospheric & Oceanographic Inform Sys AOIPS 60749 NASA Thesaurus Scope Note Definition Source Definition ATMOSPHERIC & OCEANOGRAPHIC INFORMATION SYSTEMS 1985 A data system designed primarily for the interactive manipulation of meteorological satellite images. Capabilities include displaying, analyzing, storing, and manipulating digital data in the field of meteorology and Earth resources. Used for AOIPS. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric attenuation atmospheric absorption 38845 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric boundary layer 38846 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add atmospheric chemistry 60750 NASA Thesaurus Definition Source Definition DOE 1968 Study of the production, transport, modification, and removal of atmospheric constituents in the troposphere and stratosphere. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric circulation wind circulation 60751 NASA Thesaurus Definition Source Definition DOE 1968 Global or hemispheric air movements which can be treated by equations of motion in contrast to atmospheric diffusion which is small random movement not amenable to treatment by these equations. Used for wind circulation. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add Atmospheric Cloud Physics Lab (Spacelab) ACPL (Spacelab) zero-g ACPL (Spacelab) 60752 NASA Thesaurus Definition Source Definition 1976 A NASA Spacelab mission involving cloud physics experiments in zero gravity environment. Also known as ACPL. Used for ACPL (Spacelab) and zero-g ACPL (Spacelab). 100 100 100 100 100 100 100 100 add atmospheric composition 38850 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric conditions 182375 NASA Thesaurus 100 add atmospheric conductivity 38851 NASA Thesaurus 100 100 100 100 100 100 add atmospheric correction 60753 NASA Thesaurus Definition Source Definition 1983 Removal of the effects of the intervening atmosphere from satellite imagery. 100 100 100 100 100 100 100 100 100 100 100 add atmospheric density 38853 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric diffusion 38854 NASA Thesaurus 100 100 100 100 100 100 add atmospheric effects 38855 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric electricity 60754 NASA Thesaurus Definition Source Definition SP-7 1968 Electrical phenomena, regarded collectively, which occur in the Earth's atmosphere. Also the study of electrical processes occurring within the atmosphere. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric emission 182376 NASA Thesaurus 100 add atmospheric energy sources 38857 NASA Thesaurus 100 100 100 100 100 100 100 100 add atmospheric entry planetary entry 60755 NASA Thesaurus Definition Source Definition SP-7 1968 The penetration of any planetary atmosphere by any object from outer space; specifically, the penetration of the Earth's atmosphere by a manned or unmanned capsule or spacecraft. Used for planetary entry. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric entry simulation 38859 NASA Thesaurus 100 100 100 100 100 add Atmospheric General Circulation Experiment 60756 NASA Thesaurus Definition Source Definition 1980 Model experiment of the Earth's atmospheric circulation as proposed for a Spacelab flight on which a liquid contained between two concentric spheres is subjected to rotation. The thermal driving force will be a stable radial temperature gradient and an unstable latitudinal gradient. 100 100 100 100 100 100 add Atmospheric General Circulation Models 38861 NASA Thesaurus 100 100 100 100 100 100 add atmospheric heat budget 38862 NASA Thesaurus 100 100 100 100 100 100 100 add atmospheric heating 38863 NASA Thesaurus Scope Note EXCLUDES AERODYNAMIC HEATING 100 100 100 100 100 100 add atmospheric impurities 182377 NASA Thesaurus 100 add atmospheric ionization meteoritic ionization 38864 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric lasers 60757 NASA Thesaurus Definition Source Definition 1981 The theoretical phenomena whereby the upper atmosphere is used as the lasing medium. 100 100 100 100 100 100 add atmospheric loading 182378 NASA Thesaurus 100 add atmospheric models 38866 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric moisture 38867 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric noise 182379 NASA Thesaurus 100 add atmospheric optics 60758 NASA Thesaurus Definition Source Definition SP-7 1970 The study of the optical characteristics of the atmosphere and of the optical phenomena produced by the atmosphere's suspensoids and hydrometeors. It embraces the study of refraction, reflection, diffraction, scattering, and polarization of light, but is not commonly regarded as including the study of any other kinds of radiation. 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric physics aerophysics 38869 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric pressure barometric pressure 60759 NASA Thesaurus Definition Source Definition SP-7 1968 The pressure at any point in an atmosphere due solely to the weight of the atmospheric gases above the point concerned. Used for barometric pressure. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric radiation 60760 NASA Thesaurus Definition Source Definition SP-7 1968 Infrared radiation emitted by or being propagated through the atmosphere. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric refraction 60761 NASA Thesaurus Definition Source Definition SP-7 1968 Refraction resulting when a ray of radiant energy passes obliquely through an atmosphere. 100 100 100 100 100 100 100 add atmospheric scattering 38873 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric seeing 182380 NASA Thesaurus 100 add atmospheric shells 182381 NASA Thesaurus 100 add atmospheric sounding 60762 NASA Thesaurus Definition Source Definition 1980 Measurement of atmospheric phenomena generally with instruments carried aloft by spacecraft, rockets, etc. 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric stratification atmospheric shells 60763 NASA Thesaurus Definition Source Definition SP-7 1968 The presence of strata or layers in the Earth's atmosphere. Used for atmospheric shells. 100 100 100 100 100 100 add atmospheric temperature 38876 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric tides 60764 NASA Thesaurus Definition Source Definition SP-7 1968 Defined in analogy to the oceanic tide as an atmospheric motion on a worldwide scale, in which vertical accelerations are neglected (but compressibility is taken into account). 100 100 100 add atmospheric turbulence 38878 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atmospheric windows 60765 NASA Thesaurus Definition Source Definition AGI 1972 Wavelength intervals at which the atmosphere transmits the most electromagnetic radiation. 100 100 add atmospherics atmospheric noise sferics 60766 NASA Thesaurus Definition Source Definition SP-7 1968 The radiofrequency electromagnetic radiations originating, principally, in the irregular surges of charge in thunderstorm lightning discharges. Atmospherics are heard as a quasi-steady background of crackling noise (static) in ordinary amplitude modulated radio receivers. Used for atmospheric noise and sferics. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atoll reefs 182382 NASA Thesaurus 100 add atolls 60767 NASA Thesaurus Definition Source Definition AGI 1973 Coral reefs appearing in plan view as roughly circular (though sometimes elliptical or horseshoe-shaped), and surmounted by a chain or ring of closely spaced low coral inlets that encircle a shallow lagoon in which there is no pre-existing land or islands of non-coral origin; the reefs are surrounded by deep water of the open sea, either oceanic or continental shelves. Atolls range in diameter from 1 km to more than 130 km, and are especially common today in the western and central Pacific Ocean. Atoll is derived from the native name in the Maldive Islands (Indian Ocean) which are typical examples of this structure. 100 100 100 100 add atom concentration 38882 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add atom optics 64590 NASA Thesaurus Definition Source Definition NASA Field of study addressing the manipulation of atomic beams in a way that is analogous to the manipulation of light by conventional optics. Reflection, diffraction, and focusing of the atoms is typically carried out through interaction with lasers tuned to the atomic resonances. 100 100 100 100 100 100 100 100 100 add atomic batteries 182383 NASA Thesaurus 100 add atomic beams 38883 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add atomic bombs 182384 NASA Thesaurus 100 add atomic clocks 60768 NASA Thesaurus Definition Source Definition SP-7 1968 Timekeeping devices controlled by the frequency of the natural vibrations of certain atoms. 100 100 100 100 100 100 100 100 100 add atomic clusters 38885 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add atomic collisions 38886 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atomic energy 182385 NASA Thesaurus 100 add atomic energy levels triplet excitation triplet state 38887 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add atomic excitations 38888 NASA Thesaurus 100 100 100 100 100 100 100 add atomic explosions 182386 NASA Thesaurus 100 add atomic force microscopy AFM (microscopy) 60769 NASA Thesaurus Definition Source Definition 1994 A form of microscopy that allows the imaging of general surface morphology and surface atomic structure by the measurement of the atomic forces acting on a sharply pointed probe as it is moved across the surface of a specimen. 100 100 100 100 100 100 100 100 100 100 add atomic gases 182387 NASA Thesaurus 100 add atomic interactions 38890 NASA Thesaurus 100 100 100 100 100 100 add atomic layer deposition 182388 NASA Thesaurus 100 add atomic layer epitaxy atomic layer deposition 55518 NASA Thesaurus 100 100 100 100 100 100 add atomic mass 182389 NASA Thesaurus 100 add atomic mobilities 38891 NASA Thesaurus 100 100 100 100 100 add atomic physics 38892 NASA Thesaurus 100 100 100 100 add atomic recombination 38893 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add atomic spectra 38894 NASA Thesaurus 100 100 100 100 100 100 100 add atomic structure 38895 NASA Thesaurus Scope Note THIS TERM WAS USED FOR "ELECTRONIC STRUCTURE" PRIOR TO MAY 1999 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atomic theory 38896 NASA Thesaurus 100 100 100 100 100 100 100 add atomic weights atomic mass 60770 NASA Thesaurus Definition Source Definition SP-7 1971 The weight of an atom according to a scale of atomic weight units, awu, valued as one-twelfth the mass of the carbon atom. Used for atomic mass. 100 100 100 add atomization 182390 NASA Thesaurus 100 add atomizers 38898 NASA Thesaurus 100 100 100 100 100 add atomizing atomization 38899 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add atoms 38900 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ATP 182391 NASA Thesaurus 100 add ATR-72 aircraft 38901 NASA Thesaurus 100 100 100 add ATR reactor 182392 NASA Thesaurus 100 add atrophy 38902 NASA Thesaurus 100 100 100 100 100 100 100 100 add atropine 38903 NASA Thesaurus 100 100 add ATS Applications Technology Satellites 38904 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ATS 1 38905 NASA Thesaurus 100 add ATS 2 38906 NASA Thesaurus 100 add ATS 3 38907 NASA Thesaurus 100 add ATS 4 38908 NASA Thesaurus 100 add ATS 5 38909 NASA Thesaurus 100 add ATS 6 38910 NASA Thesaurus 100 100 add ATS 7 38911 NASA Thesaurus 100 add ATS 8 38912 NASA Thesaurus 100 add ~ attachment reattachment 38913 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 add attachments 182393 NASA Thesaurus 100 add ~ attack 38914 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 add attack aircraft 38915 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add attacking (assaulting) assaulting 38916 NASA Thesaurus 100 100 100 100 100 100 add attention 38917 NASA Thesaurus 100 100 add attenuation 60771 NASA Thesaurus Definition Source Definition SP-7 1969 Reducing in intensity. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add attenuation coefficients 60772 NASA Thesaurus Definition Source Definition SP-7 1968 A measure of the space rate of attenuation of any transmitted electromagnetic radiation. 100 100 100 100 100 100 100 100 100 add attenuators 60773 NASA Thesaurus Definition Source Definition ASTM (E 500, E-7) 1968 Devices for measuring attenuation. They are usually calibrated in dB (decibels). 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add attitude control 60775 NASA Thesaurus Definition Source Definition SP-7 1968 The regulation of the attitude of an aircraft, spacecraft, etc. Also a device or system that automatically regulates and corrects attitude, especially of a pilotless vehicle. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add attitude gyros 60776 NASA Thesaurus Definition Source Definition SP-7 1968 Gyro-operated flight instruments that indicate the attitude of an aircraft or spacecraft with respect to a reference coordinate system throughout 360 degrees of rotation about each axis of the craft. 100 100 100 100 add attitude (inclination) spatial orientation tilt tilting 60774 NASA Thesaurus Definition Source Definition SP-7 1968 The position or orientation of an aircraft, spacecraft, etc., either in motion or at rest, as determined by the relationship between its axes and some reference line or plane or some fixed system of reference axes. Used for spatial orientation, tilt, and tilting. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add attitude indicators helicopter attitude indicators yawmeters 38924 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add attitude stability satellite attitude disturbance 38925 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add attraction 38926 NASA Thesaurus 100 100 100 100 add attractors (mathematics) 55519 NASA Thesaurus 100 100 100 100 100 100 100 add attributes 182394 NASA Thesaurus 100 add attrition (materials) 182395 NASA Thesaurus 100 add audio data 60777 NASA Thesaurus Definition Source Definition 1984 Useful information at audio signal frequency. 100 100 100 add audio equipment 38928 NASA Thesaurus 100 100 100 100 100 100 add audio frequencies 60778 NASA Thesaurus Scope Note Definition Source Definition APPROXIMATELY 20 TO 20,000 HZ SP-7 1968 Frequencies corresponding to normally audible sound waves. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add audio signals 60779 NASA Thesaurus Definition Source Definition 1984 Signals with a bandwidth of less than 20 kilohertz. 100 100 100 100 100 add audio tapes 38931 NASA Thesaurus 100 100 100 100 100 100 add audio visual equipment 38932 NASA Thesaurus 100 100 100 100 100 100 add audio visual material 38933 NASA Thesaurus 100 100 100 add audiology 38934 NASA Thesaurus 100 100 100 100 add audiometry 60780 NASA Thesaurus Definition Source Definition 1968 The testing and measurement of hearing at various levels. 100 100 100 100 100 100 100 100 100 100 add auditory defects deafness hearing loss 38936 NASA Thesaurus 100 100 100 100 100 100 100 add auditory fatigue 38937 NASA Thesaurus 100 100 100 100 100 add auditory perception sound perception 38938 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add auditory sensation areas 60781 NASA Thesaurus Definition Source Definition SP-7 1968 In acoustics, the frequency region enclosed by the curves defining the threshold of pain and the threshold of audibility. 100 100 100 100 add auditory signals chimes 38940 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add auditory stimuli 38941 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add auditory tasks 38942 NASA Thesaurus 100 100 100 100 add aufeis (ice) 60782 NASA Thesaurus Definition Source Definition 1980 Icing of ground or river water in Arctic areas with continuous permafrost on which the water has continued to flow. 100 100 100 100 add Auger effect 60783 NASA Thesaurus Definition Source Definition DNA The nonradiative transition of an atom from an excited electronic energy state to a lower state with the emission of an electron. The term usually refers to the x ray region of energy states. The final state corresponds to one higher degree of ionization than does the initial state. The effect is an alternative process to the transition to a lower state having the same degree of ionization with the emission of an x ray photon, and thus is analogous to the internal conversion of a nuclear transmission. 100 100 100 100 add Auger showers 182396 NASA Thesaurus 100 add Auger spectroscopy 38945 NASA Thesaurus 100 100 100 100 100 add augmentation enhancement 38946 NASA Thesaurus 100 100 100 100 100 add AUOS 182397 NASA Thesaurus 100 add Aura spacecraft 64760 NASA Thesaurus Definition Source Definition NASA The third of a series of Earth Observing System (EOS) spacecraft developed to advance the understanding of the ways that the Earth`s lands, oceans, air, ice, and life function as a total environmental system. Aura studies the Earth`s ozone, air quality and climate, and is designed exclusively to conduct research on the composition, chemistry and dynamics of the Earth`s upper and lower atmosphere employing multiple instruments on a single satellite. The spacecraft carries four instruments: the High Resolution Dynamics Limb Sounder (HIRDLS), the Microwave Limb Sounder (MLS), Ozone Monitoring Instrument (OMI), and the Tropospheric Emission Spectrometer (TES). 100 100 100 100 100 100 100 100 100 add Auriga constellation 38947 NASA Thesaurus 100 100 add Aurora 7 38948 NASA Thesaurus 100 100 add auroral absorption 38949 NASA Thesaurus 100 100 100 100 100 add auroral activity 182398 NASA Thesaurus 100 add auroral arcs 38950 NASA Thesaurus 100 100 100 add auroral echoes 38951 NASA Thesaurus 100 100 100 add auroral electrojets 38952 NASA Thesaurus 100 100 100 100 add auroral ionization 38953 NASA Thesaurus 100 100 100 100 100 100 add auroral irradiation 38954 NASA Thesaurus 100 100 100 100 100 100 add auroral spectroscopy 38955 NASA Thesaurus 100 100 100 100 100 100 100 add auroral temperature 38956 NASA Thesaurus 100 100 100 100 add auroral zones 60784 NASA Thesaurus Definition Source Definition SP-7 1968 Roughly circular bands around either geomagnetic pole above which there is a maximum of auroral activity. The zones lie about 10 deg. to 15 deg. of geomagnetic latitude from the geomagnetic poles. 100 100 100 100 100 100 100 100 add auroras auroral activity polar auroras 60785 NASA Thesaurus Definition Source Definition SP-7 1968 Sporadic radiant emissions from the upper atmosphere over middle and high latitudes. Used for auroral activity and polar auroras. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add ausforming 38959 NASA Thesaurus 100 100 100 100 add austenite 60786 NASA Thesaurus Definition Source Definition DOE 1968 A solid solution of carbon in gamma-iron. 100 100 100 100 100 100 100 add austenitic stainless steels 60787 NASA Thesaurus Definition Source Definition DOE 1968 Steels having at room temperature a microstructure consisting, at least predominantly, of austenite. Their austenitic microstructure is attained above all by alloying conditions, e.g., manganese and nickel. 100 100 100 add Austin comet 38962 NASA Thesaurus 100 add Australia 38963 NASA Thesaurus 100 100 100 100 100 100 add Australian space program 38964 NASA Thesaurus 100 100 add australites 38965 NASA Thesaurus 100 100 add Austria 38966 NASA Thesaurus 100 100 100 100 100 add Austrian space program 38967 NASA Thesaurus 100 100 add autocatalysis 38968 NASA Thesaurus 100 100 100 100 add autoclaves 38969 NASA Thesaurus 100 100 100 100 add autoclaving 38970 NASA Thesaurus 100 100 100 100 100 add autocoders 38971 NASA Thesaurus 100 100 100 100 100 add autocollimators 182399 NASA Thesaurus 100 add autocorrelation 60788 NASA Thesaurus Definition Source Definition SP-7 1968 In statistics, the simple linear internal correlation of members of a time series (ordered in time or other domains). 100 100 100 100 100 100 add autodynes 38973 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add autogyros 38974 NASA Thesaurus 100 100 add autoignition 182400 NASA Thesaurus 100 add autoionization 38975 NASA Thesaurus 100 100 100 100 add autokinesis 38976 NASA Thesaurus 100 100 add automata theory 38977 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add automated en route ATC 60789 NASA Thesaurus Definition Source Definition 1981 An air traffic control technology which allows computers to make decisions about conflict resolution, the generation of clearances, and their automatic transmission, with the operator standing by to take over in an emergency. 100 100 100 100 100 100 100 add automated guideway transit vehicles AGT 60790 NASA Thesaurus Definition Source Definition 1979 A system of a large number of captive vehicles traveling at relatively close headways on an exclusive guideway controlled by a computer. Used for AGT. 100 100 100 100 100 100 100 100 100 100 add automated mixed traffic vehicles AMTV 60791 NASA Thesaurus Definition Source Definition 1978 Low speed, surface vehicles automatically operated and controlled in a pedestrian environment by following a buried wire in the roadways sensing obstacles and stopping at predetermined spots for passenger exit and entry. Used for AMTV. 100 100 100 100 100 100 100 add automated pilot advisory system 60792 NASA Thesaurus Definition Source Definition 1981 An airport advisory system and an air traffic advisory system designed to improve airport and air traffic advisories at high density uncontrolled airports. 100 100 100 100 add automated radar terminal system 60793 NASA Thesaurus Definition Source Definition 1980 Radar tracking system for use in a terminal area. Primary and secondary radar targets are detected and data for the two are correlated for transmission to a central computer. 100 100 100 100 add Automated Transfer Vehicle 38983 NASA Thesaurus 100 100 100 100 100 100 add automated transit vehicles 38984 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 add automatic control self regulating 60794 NASA Thesaurus Definition Source Definition SP-7 1968 Control of devices and equipment, including aerospace vehicles by automatic means. Used for self regulating. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add automatic control valves 38986 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add automatic data processing 182401 NASA Thesaurus 100 add automatic flight control AFCS (control system) 38987 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add automatic frequency control AFC (control) 60795 NASA Thesaurus Definition Source Definition SP-7 1968 An arrangement whereby the frequency of an oscillator is automatically maintained within specified limits. Used for AFC (control). 100 100 100 100 100 100 100 100 add automatic gain control AGC (control) 60796 NASA Thesaurus Definition Source Definition SP-7 1968 A process by which gain is automatically adjusted as a function of input or other specified parameter. Used for AGC (control). 100 100 100 100 100 100 add automatic indexing 182402 NASA Thesaurus 100 add automatic landing control 38990 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add automatic pattern recognition 182403 NASA Thesaurus 100 add automatic picture transmission APT (picture transmission) 38991 NASA Thesaurus 100 100 100 100 100 add automatic pilots autopilots 60797 NASA Thesaurus Definition Source Definition SP-7 1968 Equipment which automatically stabilizes the attitude of a vehicle about its pitch, roll, and yaw axes. Used for autopilots. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add automatic repeat query 182404 NASA Thesaurus 100 add automatic repeat request ARQ (communication) automatic repeat query automatic request for retransmission 60798 NASA Thesaurus Definition Source Definition 1972 A request from a receiving device to retransmit the most recent block of data. 100 100 100 100 100 100 100 100 100 100 add automatic request for retransmission 182405 NASA Thesaurus 100 add automatic rocket impact predictors 182406 NASA Thesaurus 100 100 add automatic test equipment 38994 NASA Thesaurus 100 100 100 100 100 add automatic traffic advisory and resolution ATARS 60799 NASA Thesaurus Scope Note Definition Source Definition AUTOMATIC TRAFFIC ADVISORY AND RESOLUTION SERVICE 1980 Ground based collision avoidance system using the surveillance and data link capabilities of the discrete address beacon system (DABS). Used for ATARS. 100 100 100 100 100 100 100 add automatic typewriters Flexowriters (trademark) 38996 NASA Thesaurus 100 100 100 100 100 100 add Automatic Universal Orbiting Stations AUOS 38997 NASA Thesaurus 100 100 100 100 100 100 add automatic weather stations 60800 NASA Thesaurus Definition Source Definition 1976 Weather stations at which the services of observers are not required. They are usually equipped with telemetric apparatus. 100 100 100 100 100 100 100 100 add ~ automation instrumental analysis 38999 NASA Thesaurus Scope Note USE OF A MORE SPECIFIC TERM IS RECOMMENDED--CONSULT THE TERMS LISTED BELOW 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add automobile accidents 39000 NASA Thesaurus 100 100 100 100 add automobile engines 39001 NASA Thesaurus 100 100 100 100 100 100 100 add automobile fuels 39002 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add automobiles jeeps 39003 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add automorphisms 39004 NASA Thesaurus 100 add autonomic nervous system 39005 NASA Thesaurus 100 100 100 100 add autonomous docking 64763 NASA Thesaurus Definition Source Definition NASA Automatic, self-controlled docking enabled through the use of specialized hardware, sensors, and algorithms for navigation, guidance, and positioning. 100 100 100 100 100 100 100 100 100 100 100 100 100 add autonomous navigation 39006 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add autonomous spacecraft clocks 60801 NASA Thesaurus Definition Source Definition 1980 Standard Time scale instruments aboard spacecraft with provisions for synchronization with existing satellite-based system (global positioning system, for example). 100 100 100 100 100 add autonomy 39008 NASA Thesaurus 100 100 100 100 100 100 100 100 add autopilots 182407 NASA Thesaurus 100 add autopsies 39009 NASA Thesaurus 100 100 add autoradiography 60802 NASA Thesaurus Definition Source Definition 1988 A technique that uses x ray film to visualize radioactivly labeled molecules or fragments of molecules used in analyzing the length and number of DNA fragements separated by gel electrophoresis. 100 100 100 add autoregressive moving average ARMA (mathematics) 55560 NASA Thesaurus 100 100 100 100 100 100 100 100 add autoregressive processes 39011 NASA Thesaurus 100 100 100 100 100 add autorotation windmilling 60803 NASA Thesaurus Definition Source Definition FAA 1988 A rotorcraft flight condition in which the lifting rotor is driven entirely by action of the air when the rotorcraft is in motion. 100 100 100 100 add autotrophs 60804 NASA Thesaurus Definition Source Definition DOE 1968 Organisms capable of synthesizing organic nutrients directly from simple inorganic substances such as carbon dioxide and inorganic nitrogen. 100 100 add autumn 60805 NASA Thesaurus Definition Source Definition 1985 The season of the year between summer and winter. Its beginning is marked by the autumnal equinox and its end by the winter solstice. 100 100 100 100 add auxiliary equipment (computers) 182408 NASA Thesaurus 100 add auxiliary power sources 39015 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add auxiliary propulsion 39016 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add auxins 64687 NASA Thesaurus Definition Source Definition MeSH Plant hormones which promote tissue growth through cell elongation rather than multiplication. 100 100 100 100 100 add AV-8A aircraft 182409 NASA Thesaurus 100 add AV-8B aircraft 182410 NASA Thesaurus 100 add availability 39017 NASA Thesaurus 100 100 100 100 100 add avalanche diodes IMPATT diodes TRAPATT diodes Zener diodes 60806 NASA Thesaurus Definition Source Definition FAA 1988 A solid state device that takes advantage of avalanche multiplication of the photocurrent. 100 100 100 100 100 100 100 100 100 100 100 100 add avalanches 39019 NASA Thesaurus 100 100 100 100 100 100 add AVCS 182411 NASA Thesaurus 100 add average 39020 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add AVHRR 182412 NASA Thesaurus 100 add Avian 2/180 autogiro 39021 NASA Thesaurus 100 100 add aviation 182413 NASA Thesaurus 100 add aviation meteorology 60807 NASA Thesaurus Definition Source Definition 1987 Weather conditions and meteorological studies pertaining to aeronautics. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add aviation psychology 39023 NASA Thesaurus 100 100 100 100 100 100 100 100 add aviators 182414 NASA Thesaurus 100 add avionics 60808 NASA Thesaurus Definition Source Definition 1988 The use of electronics in all its forms in airborne or aerospace vehicles. 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 add avoidance 39025 NASA Thesaurus 100 100 100 100 100 100 100 add AVRO 698 aircraft 182415 NASA Thesaurus 100 add AVRO 707 aircraft 39026 NASA Thesaurus 100 100 100 100 100 100 100 100 add AVRO Whitworth HS-748 aircraft 182416 NASA Thesaurus 100 add AWACS aircraft Airborne Warning and Control System 39027 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add awards 60809 NASA Thesaurus Scope Note Definition Source Definition EXCLUDES CONTACTS & GRANTS 1982 Distinctions that are bestowed upon a person or persons due to their special contributions to a field. 100 100 100 100 add AXAF 182417 NASA Thesaurus 100 add axes (coordinates) 182418 NASA Thesaurus 100 add axes of rotation 39030 NASA Thesaurus 100 100 100 100 100 100 100 add axes (reference lines) 39029 NASA Thesaurus 100 100 add axial compression loads 39031 NASA Thesaurus 100 100 100 100 100 100 100 100 100 add axial compressors 182419 NASA Thesaurus 100 add axial flow 39032 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add axial flow compressors 182420 NASA Thesaurus 100 add axial flow pumps 39033 NASA Thesaurus 100 100 100 100 add axial flow turbines 39034 NASA Thesaurus 100 100 100 100 add axial loads 39035 NASA Thesaurus 100 100 100 100 100 100 100 100 add axial modes 60810 NASA Thesaurus Definition Source Definition 1981 Regimes of vibration along a given axis. 100 100 100 100 100 add axial strain axisymmetric deformation uniaxial strain 60811 NASA Thesaurus Definition Source Definition ASTM (E 6, E-28) 1968 Linear strain in a plane parallel to the longitudinal axis of the specimen. Used for axisymmetric deformation and uniaxial strain. 100 100 100 100 100 100 100 add axial stress 39038 NASA Thesaurus 100 100 add axioms postulates 39039 NASA Thesaurus 100 100 100 100 100 add axisymmetric bodies 39040 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add axisymmetric deformation 182421 NASA Thesaurus 100 add axisymmetric flow 39041 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 100 add axisymmetry 182422 NASA Thesaurus 100 add axles 182423 NASA Thesaurus 100 add axons 39042 NASA Thesaurus 100 100 100 100 add azeotropes 39043 NASA Thesaurus 100 100 100 add Azerbaijan 39044 NASA Thesaurus 100 100 100 add azides (inorganic) 39045 NASA Thesaurus 100 100 100 add azides (organic) 39046 NASA Thesaurus 100 100 100 100 add azimuth solar azimuth 60812 NASA Thesaurus Definition Source Definition SP-7 1968 Horizontal direction or bearing. Used for solar azimuth. 100 100 100 100 100 100 100 100 100 100 100 100 add azines 39048 NASA Thesaurus 100 100 100 100 100 100 100 100 add azo compounds 39049 NASA Thesaurus 100 100 100 100 100 add azoles 60813 NASA Thesaurus Definition Source Definition DOE 1968 Compounds that contain a five-membered heterocylic ring containing one or more nitrogen atoms. 100 100 100 100 add Azores 39051 NASA Thesaurus 100 100 100 add Azotobacter 39052 NASA Thesaurus 100 add azulene 39053 NASA Thesaurus 100 100 add Azur satellite 39054 NASA Thesaurus 100 100 100 100 add B-1 aircraft 39056 NASA Thesaurus 100 100 100 100 100 100 100 100 100 100 100 add B-2 aircraft stealth bomber 39057 NASA Thesaurus 100 100 100 100 100 100 100 add B-26 aircraft Invader aircraft 39058 NASA Thesaurus