Air chamber
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 o...
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.
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Air cock
Air″ cock′ (�). A faucet to allow escape of air.
Air cooling
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 expos...
Air drill
Air″ drill′ (�). A drill driven by the elastic pressure of condensed air; a pneumatic drill. Knight.
Air engine
Air″ engine′ (�). An engine driven by heated or by compressed air. Knight.
Air gap
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
Air″ gas′ (�). See under Gas.
Air gun
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,...
Air hole
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 (2)
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
Air″ jack′et (�). A jacket having air-tight cells, or cavities which can be filled with air, to render persons buoyant in swimming.
Air level
Air″ lev′el (�). Spirit level. See Level.
Air line
Air line. A path through the air made easy for aërial navigation by steady winds.
Air pipe
Air″ pipe′ (�). A pipe for the passage of air; esp. a ventilating pipe.
Air plant
Air″ plant′ (�). (Bot.) A plant deriving its sustenance from the air alone; an aërophyte.☞ The “Florida moss” (Tillandsia), many tropical orchids, and most mosses and lichens ar...
Air poise
Air″ poise′ (�). [See Poise.] An instrument to measure the weight of air.
Air pump
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 p...
Air sac
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
Air″ shaft′ (�). A passage, usually vertical, for admitting fresh air into a mine or a tunnel.
Air stove
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
Air″ ves′sel (�). 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 ...
Air-built
Air″–built′ (�), a. Erected in the air; having no solid foundation; chimerical; as, an air-built castle.
Air-drawn
Air″–drawn″ (�), a. Drawn in air; imaginary.This is the air-drawn dagger.Shak.
Air-slacked
Air″–slacked′ (�), a. Slacked, or pulverized, by exposure to the air; as, air-slacked lime.
Air-tight
Air″–tight′ (�), a. So tight as to be impermeable to air; as, an air-tight cylinder.
Air-tight (2)
Air″–tight′, n. A stove the draft of which can be almost entirely shut off.
Aircraft
Air″craft′ (?), n. sing. & pl. Any device, as a balloon, aëroplane, etc., for floating in, or flying through, the air.