Air balloon. See Balloon. Air bath. (a) An apparatus for the application of air to the body. (b) An arrangement for drying substances in air of any desired temperature.Air castle. See Castle in the air, under Castle.Air compressor, a machine for compressing air to be used as a motive power.Air crossing, a passage for air in a mine.Air cushion, an air-tight cushion which can be inflated; also, a device for arresting motion without shock by confined air.Air fountain, a contrivance for producing a jet of water by the force of compressed air.Air furnace, a furnace which depends on a natural draft and not on blast.Air line, a straight line; a bee line. Hence Air-line, adj.; as, air-line road.Air lock(Hydr. Engin.), an intermediate chamber between the outer air and the compressed- air chamber of a pneumatic caisson. Knight.Air port(Nav.), a scuttle or porthole in a ship to admit air.Air spring, a spring in which the elasticity of air is utilized.Air thermometer, a form of thermometer in which the contraction and expansion of air is made to measure changes of temperature.Air threads, gossamer.Air trap, a contrivance for shutting off foul air or gas from drains, sewers, etc.; a stench trap.Air trunk, a pipe or shaft for conducting foul or heated air from a room.Air valve, a valve to regulate the admission or egress of air; esp. a valve which opens inwardly in a steam boiler and allows air to enter.Air way, a passage for a current of air; as the air way of an air pump; an air way in a mine.In the air. (a) Prevalent without traceable origin or authority, as rumors. (b) Not in a fixed or stable position; unsettled. (c) (Mil.) Unsupported and liable to be turned or taken in flank; as, the army had its wing in the air.To take air, to be divulged; to be made public.To take the air, to go abroad; to walk or ride out.

(Air) v. t. [imp. & p. p. Aired (ârd); p. pr. & vb. n. Airing.] [See Air, n., and cf. Aërate.]

1. To expose to the air for the purpose of cooling, refreshing, or purifying; to ventilate; as, to air a room.

It were good wisdom . . . that the jail were aired.

Were you but riding forth to air yourself.

2. To expose for the sake of public notice; to display ostentatiously; as, to air one's opinion.

Airing a snowy hand and signet gem.

3. To expose to heat, for the purpose of expelling dampness, or of warming; as, to air linen; to air liquors.

Air bed
(Air" bed`) A sack or matters inflated with air, and used as a bed.

Air bladder
(Air" blad`der)

1. (Anat.) An air sac, sometimes double or variously lobed, in the visceral cavity of many fishes. It originates in the same way as the lungs of air-breathing vertebrates, and in the adult may retain a tubular connection with the pharynx or esophagus.

2. A sac or bladder full of air in an animal or plant; also an air hole in a casting.

Air brake
(Air" brake`) (Mach.) A railway brake operated by condensed air. Knight.

14. (Paint.) (a) The representation or reproduction of the effect of the atmospheric medium through which every object in nature is viewed. New Am. Cyc. (b) Carriage; attitude; action; movement; as, the head of that portrait has a good air. Fairholt.

15. (Man.) The artificial motion or carriage of a horse.

Air is much used adjectively or as the first part of a compound term. In most cases it might be written indifferently, as a separate limiting word, or as the first element of the compound term, with or without the hyphen; as, air bladder, air-bladder, or airbladder; air cell, air-cell, or aircell; air-pump, or airpump.

  By PanEris using Melati.

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