Webster's Dictionary, 1913

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Air cooling In gasoline-engine motor vehicles, the cooling of the cylinder by increasing its radiating surface by means of ribs or radiators, and placing it so that it is exposed to a current of air. Confer Water cooling . -- Air"- cooled` , adjective

Air drill A drill driven by the elastic pressure of condensed air; a pneumatic drill. Knight.

Air engine An engine driven by heated or by compressed air. Knight.

Air gap (Physics) An air-filled gap in a magnetic or electric circuit; specif., in a dynamo or motor, the space between the field-magnet poles and the armature; clearance.

Air gas See under Gas .

Air gun (gŭn`). A kind of gun in which the elastic force of condensed air is used to discharge the ball. The air is powerfully compressed into a reservoir attached to the gun, by a condensing pump, and is controlled by a valve actuated by the trigger.

Air hole (hōl`).
1. A hole to admit or discharge air; specifically, a spot in the ice not frozen over.

2. (Founding) A fault in a casting, produced by a bubble of air; a blowhole.

Air hole (Aëronautics) A local region in the atmosphere having a downward movement and offering less than normal support for the sustaining surfaces of a flying machine.

Air jacket A jacket having air-tight cells, or cavities which can be filled with air, to render persons buoyant in swimming.

Air level Spirit level. See Level .

Air line A path through the air made easy for aërial navigation by steady winds.

Air pipe A pipe for the passage of air; esp. a ventilating pipe.

Air plant (Botany) A plant deriving its sustenance from the air alone; an aërophyte.

» 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 .

Air poise [ See Poise .] An instrument to measure the weight of air.

Air pump
1. (Physics) A kind of pump for exhausting air from a vessel or closed space; also, a pump to condense air or force it into a closed space.

2. (Steam Engines) A pump used to exhaust from a condenser the condensed steam, the water used for condensing, and any commingled air.

Air sac (Anat.) One of the spaces in different parts of the bodies of birds, which are filled with air and connected with the air passages of the lungs; an air cell.

Air shaft A passage, usually vertical, for admitting fresh air into a mine or a tunnel.

Air stove A stove for heating a current of air which is directed against its surface by means of pipes, and then distributed through a building.

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 tracheæ , of plants spiral vessels .

Air-built adjective Erected in the air; having no solid foundation; chimerical; as, an air-built castle.

Air-drawn adjective Drawn in air; imaginary.

This is the air-drawn dagger.
Shak.

Air-slacked adjective Slacked, or pulverized, by exposure to the air; as, air-slacked lime.

Air-tight adjective So tight as to be impermeable to air; as, an air-tight cylinder.

Air-tight noun A stove the draft of which can be almost entirely shut off. [ Colloq. U. S.]

Aircraft noun sing. & plural Any device, as a balloon, aëroplane, etc., for floating in, or flying through, the air.

Airer noun
1. One who exposes to the air.

2. A frame on which clothes are aired or dried.

Airily (âr"ĭ*lȳ) adverb In an airy manner; lightly; gaily; jauntily; flippantly.

Airiness noun
1. The state or quality of being airy; openness or exposure to the air; as, the airiness of a country seat.

2. Lightness of spirits; gayety; levity; as, the airiness of young persons.

Airing (âr"ĭng) noun
1. A walk or a ride in the open air; a short excursion for health's sake.

2. An exposure to air, or to a fire, for warming, drying, etc.; as, the airing of linen, or of a room.

Airless adjective Not open to a free current of air; wanting fresh air, or communication with the open air.

Airlike adjective Resembling air.

Airling noun A thoughtless, gay person. [ Obsolete] "Slight airlings ." B. Jonson.

Airman noun A man who ascends or flies in an aircraft; a flying machine pilot.

Airmanship noun Art, skill, or ability in the practice of aërial navigation.

Airol noun (Pharm.) A grayish green antiseptic powder, consisting of a basic iodide and gallate of bismuth, sometimes used in place of iodoform. [ A Trademark]

Airometer noun [ Air + - meter .] A hollow cylinder to contain air. It is closed above and open below, and has its open end plunged into water.

Airsick adjective Affected with aërial sickness . -- Air"sick`ness , noun

Airward, Airwards adverb Toward the air; upward. [ R.] Keats.

Airwoman noun A woman who ascends or flies in an aircraft.

Airy adjective
1. Consisting of air; as, an airy substance; the airy parts of bodies.

2. Relating or belonging to air; high in air; aërial; as, an airy flight. "The airy region." Milton.

3. Open to a free current of air; exposed to the air; breezy; as, an airy situation.

4. Resembling air; thin; unsubstantial; not material; airlike. "An airy spirit." Shak.

5. Relating to the spirit or soul; delicate; graceful; as, airy music.

6. Without reality; having no solid foundation; empty; trifling; visionary. " Airy fame." Shak.

Empty sound, and airy notions.
Roscommon.

7. Light of heart; vivacious; sprightly; flippant; superficial. "Merry and airy ." Jer. Taylor.

8. Having an affected manner; being in the habit of putting on airs; affectedly grand. [ Colloq.]

9. (Paint.) Having the light and aërial tints true to nature. Elmes.

Aisle noun [ Old French ele , French aile , wing, wing of a building, Latin ala , contr. from axilla .] (Architecture) (a) A lateral division of a building, separated from the middle part, called the nave, by a row of columns or piers, which support the roof or an upper wall containing windows, called the clearstory wall. (b) Improperly used also for the have; -- as in the phrases, a church with three aisles , the middle aisle . (c) Also (perhaps from confusion with alley ), a passage into which the pews of a church open.

Aisled adjective Furnished with an aisle or aisles.

Aisless adjective Without an aisle.

Ait noun [ Anglo-Saxon ..., ..., perhaps dim. of īeg , īg , island. See Eyot .] An islet, or little isle, in a river or lake; an eyot.

The ait where the osiers grew.
R. Hodges (1649).

Among green aits and meadows.
Dickens.

Ait noun Oat. [ Scot.] Burns.

Aitch noun The letter h or H.

Aitchbone noun [ For nachebone . For loss of n , confer Adder . See Natch .] The bone of the rump; also, the cut of beef surrounding this bone. [ Spelt also edgebone .]

Aitiology noun See Ætiology .

Ajar adverb [ Middle English on char ajar, on the turn; Anglo-Saxon cerr , cyrr , turn, akin to German kehren to turn, and to Dutch akerre . See Char .] Slightly turned or opened; as, the door was standing ajar .

Ajar adverb [ Prefix a- + jar .] In a state of discord; out of harmony; as, he is ajar with the world.