Part 159

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

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

Air"-built` (&?;), a. Erected in the air; having no solid foundation; chimerical; as, an air-built castle.

Air" cell` (&?;). 1. (Bot.) A cavity in the cellular tissue of plants, containing air only.

2. (Anat.) A receptacle of air in various parts of the system; as, a cell or minute cavity in the walls of the air tubes of the lungs; the air sac of birds; a dilatation of the air vessels in insects.

Air" cham`ber (&?;). 1. A chamber or cavity filled with air, in an animal or plant.

2. A cavity containing air to act as a spring for equalizing the flow of a liquid in a pump or other hydraulic machine.

Air" cock` (&?;). A faucet to allow escape of air.

Air"-drawn" (&?;), a. Drawn in air; imaginary.

This is the air-drawn dagger. Shak.

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"er (&?;), n. 1. One who exposes to the air.

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

Air" gas` (&?;). See under Gas.

Air" gun` (gn`). 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` (hl`). 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"i*ly (âr"*l), adv. In an airy manner; lightly; gaily; jauntily; flippantly.

Air"i*ness, n. 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.

Air"ing (âr"ng), n. 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.

Air" jack`et (&?;). A jacket having air-tight cells, or cavities which can be filled with air, to render persons buoyant in swimming.

Air"less (&?;), a. Not open to a free current of air; wanting fresh air, or communication with the open air.

Air" lev`el (&?;). Spirit level. See Level.

Air"like` (&?;), a. Resembling air.

Air"ling (&?;), n. A thoughtless, gay person. [Obs.] "Slight airlings." B. Jonson.