| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
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| RP | radial pulse; radiopharmaceutical; rapid processing [of film]; Raynaud phenomenon; reactive protein;... |
| RPF | relaxed pelvic floor; renal plasma flow; retroperitoneal fibrosis |
| RPLAD | retroperitoneal lymphadenectomy |
| AC | 1) Adenylate Cyclase 2) Abdominal Circumference 3) Air Con... |
| air-lock | <microscopy> An intermediate, enclosed chamber of a vacuum or pressure system through which an object may be passed without effectively changing the vacuum or pressure of the main body of the system. Reference here is to the vacuum of all electron microscopes. (05 Aug 1998) |
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| air microbiology | The presence of bacteria, viruses, and fungi in the air. This term is not restricted to pathogenic organisms. (12 Dec 1998) |
| air plant | <botany> A plant deriving its sustenance from the air alone; an aerophyte. The "Florida moss" (Tillandsia), many tropical orchids, and most mosses and lichens are air plants. Those which are lodged upon trees, but not parasitic on them, are epiphytes. Source: Websters Dictionary (01 Mar 1998) |
| air pollutants | Substances which pollute the air. (12 Dec 1998) |
| air pollutants, environmental | Air pollutants which affect environmental conditions. (12 Dec 1998) |
| air pollutants, occupational | Air pollutants found in the work area. They are usually produced by the specific nature of the occupation. (12 Dec 1998) |
| air pollutants, radioactive | Pollutants, present in air, which exhibit radioactivity. (12 Dec 1998) |
| air pollution, indoor | The contamination of indoor air. (12 Dec 1998) |
| air pressure | The force per unit area that the air exerts on any surface in contact with it. Primarily used for articles pertaining to air pressure within a closed environment. (12 Dec 1998) |
| air pump | 1. <physics> A kind of pump for exhausting air from a vessel or closed space; also, a pump to condense air of force in into a closed space. 2. <engineering> A pump used to exhaust from a condenser the condensed steam, the water used for condensing, and any commingled air. Source: Websters Dictionary (01 Mar 1998) |
| air quality maintenance area | Specific populated area where air quality is a problem for one or more pollutants (Portland-Vancouver, Salem, Eugene-Springfield, Medford-Ashland). (05 Dec 1998) |
| air sac | <zoology> Thin-walled sacs or spaces which function as a part of the respiratory system in birds, fishes, insects, and mammals. The sacs are filled with air and connected with the air passages of the lungs; an air cell. Source: Websters Dictionary (04 Jul 1999) |
| air splint | A plastic splint inflated by air used to immobilise part or all of an extremity. Synonym: inflatable splint. (05 Mar 2000) |
| air syringe | A tapered metal tube through which air is forced from a rubber bulb or pressure tank to blow debris from, or to dry, a cavity in preparing teeth for restoration. Synonym: air syringe. (05 Mar 2000) |
| air thermometer | See: gas thermometer. (05 Mar 2000) |