| PRBC | packed red blood cells; placental residual blood volume |
|---|---|
| PRBV | placental residual blood volume |
| pTNM | TNM staging of tumors as determined by correlation of clinical, pathologic, and residual findings |
| PVR | peripheral vascular resistance; perspective volume rendering; poliovirus receptor; postvoiding resid... |
| RLC | residual lung capacity |
| 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) |
| air tube | The trachea, or a bronchus or any of its branches conveying air to the lungs. (05 Mar 2000) |
| air vesicles | One of the thin-walled saclike terminal dilations of the respiratory bronchioles, alveolar ducts, and alveolar sacs across which gas exchange occurs between alveolar air and the pulmonary capillaries. Synonym: alveoli pulmonis, alveolus, air cells, air vesicles, bronchic cells. (05 Mar 2000) |
| air vessel | A vessel, cell, duct, or tube containing or conducting air; as the air vessels of insects, birds, plants, etc.; the air vessel of a pump, engine, etc. For the latter, see Air chamber. The air vessels of insects are called tracheae, of plants spiral vessels. Source: Websters Dictionary (01 Mar 1998) |