Etymology
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air-rifle (n.)
rifle that uses compressed air power to fire the projectile, 1851, from air (n.1) + rifle (n.).
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air-space (n.)

also airspace, by 1821 in reference to stove and furnace construction, from air (n.1) + space (n.). From 1852 in reference to the cubic contents of a room (with reference to the persons in it) in sanitary regulations for boarding rooms, hospitals, etc. In firearms, "a vacant space between the powder charge and the projectile" (1847). By 1910 as "portion of the atmosphere controlled by a country above its territory."

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air-lock (n.)

by 1851, "air-tight chamber in which operations are carried on under water," to regulate pressure for the safety of workers, from air (n.1) + lock (n.1) in the canal sense.

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air-hole (n.)

"an opening to admit or discharge air," 1766, from air (n.1) + hole (n.).

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open-air (adj.)

"outdoor, in the open air," 1520s, from open (adj.) + air (n.1).

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air-conditioner (n.)
from air (n.1) + conditioner. Along with air-conditioning first attested 1909, originally an industrial process in textile manufacturing. The word conditioning was applied to the determination of the moisture content of textiles, control of which was essential to spin fine cotton yarns. The original purpose of air-conditioning was to purify air and regulate moisture. In 1906 Stuart W. Cramer of Charlotte, N.C., and Willis H. Carrier of Buffalo, N.Y., independently devised methods of using a fine spray of water to cool air. Self-contained air-conditioning units, complete with refrigeration equipment, were widely used to cool air in U.S. stores, restaurants, etc. from the 1930s. An earlier name for such a device (using ice and fans) was air cooler (1875).
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air-freshener (n.)
1945, from air (n.1) + agent noun from freshen.
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air-raid (n.)

1914, from air (n.1) meaning "by aircraft" + raid (n.); originally in reference to British attacks Sept. 22, 1914, on Zeppelin bases at Cologne and Düsseldorf in World War I. The German word is Fliegerangriff "aviator-attack," and if Old English had survived into the 20th century our word instead might be fleogendeongrype.

One didn't dare to inhale for fear of breathing it in. It was the sound of eighteen hundred airplanes approaching Hamburg from the south at an unimaginable height. We had already experienced two hundred or even more air raids, among them some very heavy ones, but this was something completely new. And yet there was an immediate recognition: this was what everyone had been waiting for, what had hung for months like a shadow over everything we did, making us weary. It was the end. [Hans Erich Nossack, "Der Untergang," 1942]
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