Air Bags. Airbags . Air Bag . Airbag . Bag, Air . Bags, Air . Automotive safety devices consisting of a bag designed to inflate upon collision and prevent passengers from pitching forward. (American Heritage Dictionary, 1982) . 0.66
Airports. Airport . Terminal facilities used for aircraft takeoff and landing and including facilities for handling passengers. (from McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed.) . 0.47
Particulate Matter. Air Pollutants, Particulate . Airborne Particulate Matter . Ambient Particulate Matter . Particulate Air Pollutants . Particulate Matter, Airborne . Particulate Matter, Ambient . Pollutants, Particulate Air . Airborne Particles . Particles . Particulates . Suspended Dust . Suspended Particles . Particles of any solid substance, generally under 30 microns in size, often noted as PM30. There is special concern with PM1 which can get down to PULMONARY ALVEOLI and induce MACROPHAGE ACTIVATION and PHAGOCYTOSIS leading to FOREIGN BODY REACTION and LUNG DISEASES. . 0.46
Aircraft. Airplanes . Airplane . Ejection Seat . Helicopter . Seat, Ejection . Seats, Ejection . Ejection Seats . Helicopters . A weight-carrying structure for navigation of the air that is supported either by its own buoyancy or by the dynamic action of the air against its surfaces. (Webster, 1973) . 0.45
Air Sacs. Air Bladders . Air Sac . Bladder, Air . Bladders, Air . Sac, Air . Sacs, Air . Swimbladders . Air Bladder . Swimbladder . Thin-walled sacs or spaces which function as a part of the respiratory system in birds, fishes, insects, and mammals. . 0.45