1. A mixture of odorless gases found in the atmosphere in the following approximate percentages by volume after water vapor has been removed: oxygen, 20.95; nitrogen, 78.08; argon 0.93; carbon dioxide, 0.03; other gases, 0.01. Formerly used to mean any respiratory gas, regardless of its composition. 2. SYN: ventilate. [G. aer; L. aer]
- alveolar a. SYN: alveolar gas.
- complemental a. SYN: inspiratory reserve volume.
- complementary a. SYN: inspiratory capacity.
- a. hunger extremely deep ventilation such as occurs in patients with acidosis attempting to increase ventilation of alveoli and exhale more carbon dioxide. SEE ALSO: Kussmaul respiration.
- liquid a. a. that, by means of intense cold and pressure, has been liquefied.
- minimal a. the volume of gas that remains in the lungs and cannot be expelled after they have been removed from the body, or after the chest has been opened.
- reserve a. SYN: expiratory reserve volume.
- residual a. SYN: residual volume.
- supplemental a. SYN: expiratory reserve volume.
- tidal a. SYN: tidal volume.
- vitiated a. a. containing a reduced percentage of oxygen.
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acute insulin response; airway responsiveness; amino-imidazole ribonucleotide; aortoiliac reconstruction; automated image registration; average impairment rating

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air 'a(ə)r, 'e(ə)r n a mixture of invisible odorless tasteless sound-transmitting gases that is composed by volume chiefly of 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, 0.03 percent carbon dioxide, varying amounts of water vapor, and minute amounts of rare gases (as helium), that surrounds the earth with half its mass within four miles of the earth's surface, that has a pressure at sea level of about 14.7 pounds per square inch, and that has a density of 1.293 grams per liter at 0°C and 760 mm pressure

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(ār) [L. aer, from Gr. aēr] the gaseous mixture that makes up the earth's atmosphere; it is an odorless, colorless gas, consisting of about 1 part by volume of oxygen to 4 parts of nitrogen, the proportion varying somewhat according to conditions. It also contains small amounts of carbon dioxide, ammonia, argon, and other gases and organic matter.

Medical dictionary. 2011.


Look at other dictionaries:

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  • air — 1. (êr) s. m. 1°   Fluide invisible, transparent, sans odeur ni saveur, pesant, compressible, élastique, qui forme autour de la terre une couche nommée atmosphère, et qui est composé de 0,79 d azote et de 0,21 d oxygène. L air était un des quatre …   Dictionnaire de la Langue Française d'Émile Littré

  • air — AIR. s. m. Celui des quatre Élémens qui environne le globe de la terre. L air est plus léger que l eau. La basse, la haute, la moyenne région de l air. Une colonne d air. La pesanteur de l air. La circulation de l air. L air se dilate, se raréfie …   Dictionnaire de l'Académie Française 1798

  • Air — ([^a]r), n. [OE. air, eir, F. air, L. a[ e]r, fr. Gr. ah r, air, mist, for a[digamma]hr, fr. root a[digamma] to blow, breathe, probably akin to E. wind. In sense 10 the French has taking a meaning fr. It. aria atmosphere, air, fr. the same Latin… …   The Collaborative International Dictionary of English

  • air — air; Air·bra·sive; air·crafts·man; air·crafts·wom·an; air·crew·man; Air·dent; air·drau·lic; air·drome; air·graph; air·i·fied; air·i·ly; air·i·ness; air·ish; air·less; air·man; air·man·ship; air·scape; an·ti·air; an·ti·air·craft·er;… …   English syllables

  • air — [er, ar] n. [ME < OFr < L aer < Gr aēr, air, mist] 1. the elastic, invisible mixture of gases (chiefly nitrogen and oxygen, as well as hydrogen, carbon dioxide, argon, neon, helium, etc.) that surrounds the earth; atmosphere 2. space… …   English World dictionary

  • air — ► NOUN 1) the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen. 2) the open space above the surface of the earth. 3) (before another noun ) indicating the use of aircraft: air travel. 4) the earth s… …   English terms dictionary

  • air — n 1 Air, atmosphere, ether, ozone. Air designates the invisible mixture of gases which surrounds the earth and is the impalpable respirable substance essential to life {the air we breathe} or that substance mixed with or contaminated by other… …   New Dictionary of Synonyms

  • air — Air, Mot d une syllabe, Aer, Dium, Spiritus. A l air, Sub dio, siue Sub diuo. Estre à l air, Sub dio agere. Air assemblé, Aer concretus. Bon air, Bonum caelum. Bonté et attrempance de l air, Salubritas caeli atque temperies. Un air doux et bien… …   Thresor de la langue françoyse

  • Air — ([^a]r), v. t. [imp. & p. p. {Aired} ([^a]rd); p. pr. & vb. n. {Airing}.] [See {Air}, n., and cf. {A[eum]rate}.] 1. To expose to the air for the purpose of cooling, refreshing, or purifying; to ventilate; as, to air a room. [1913 Webster] It were …   The Collaborative International Dictionary of English

  • Air — es el nombre de ● Air, una banda francesa de música electrónica. ● Air, una serie de anime publicada en 2005. * * * (as used in expressions) Air France Compagnie Internationale Air France Eastern Air Lines, Inc. United States Air Force Royal Air… …   Enciclopedia Universal

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