Part 275

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

<i>Fairholt.</i>

<p><b>15.</b> <fld>(Man.)</fld> <def>The artificial motion or carriage of a horse.</def>

<note>&hand; <i>Air</i> 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, <i>air</i> bladder, <i>air</i>-bladder, or <i>air</i>bladder; <i>air</i> cell, <i>air</i>-cell, or <i>air</i>cell; <i>air</i>-pump, or <i>air</i>pump.</note>

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

<h1>Air</h1> <Xpage=35>

<hw>Air</hw> <tt>(#)</tt>, <tt>v. t.</tt> <wordforms>[<tt>imp. & p. p.</tt> <er>Aired</er> <tt>(#)</tt>; <tt>p. pr. & vb. n.</tt> <er>Airing</er>.]</wordforms> <ety>[See <er>Air</er>, <tt>n.</tt>, and cf. <er>A<?/rate</er>.]</ety> <p><b>1.</b> <def>To expose to the air for the purpose of cooling, refreshing, or purifying; to ventilate; <as>as, to <ex>air</ex> a room</as>.</def>

<blockquote>It were good wisdom . . . that the jail were <b>aired</b>. <i>Bacon.</i></blockquote>

<blockquote>Were you but riding forth to <b>air</b> yourself. <i>Shak.</i></blockquote>

<p><b>2.</b> <def>To expose for the sake of public notice; to display ostentatiously; <as>as, to <ex>air</ex> one's opinion</as>.</def>

<blockquote><b>Airing</b> a snowy hand and signet gem. <i>Tennyson.</i></blockquote>

<p><b>3.</b> <def>To expose to heat, for the purpose of expelling dampness, or of warming; <as>as, to <ex>air</ex> linen; to <ex>air</ex> liquors.</as></def>

<h1>Air bed</h1> <Xpage=35>

<hw>Air" bed`</hw> <tt>(#)</tt>. <def>A sack or matters inflated with air, and used as a bed.</def>

<h1>Air bladder</h1> <Xpage=35>

<hw>Air" blad`der</hw> <tt>(#)</tt>. <p><b>1.</b> <fld>(Anat.)</fld> <def>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.</def>

<p><b>2.</b> <def>A sac or bladder full of air in an animal or plant; also an air hole in a casting.</def>

<h1>Air brake</h1> <Xpage=35>

<hw>Air" brake`</hw> <tt>(#)</tt>. <fld>(Mach.)</fld> <def>A railway brake operated by condensed air.</def>

<i>Knight.</i>

<h1>Air-built</h1> <Xpage=35>

<hw>Air"-built`</hw> <tt>(#)</tt>, <tt>a.</tt> <def>Erected in the air; having no solid foundation; chimerical; <as>as, an <ex>air</ex>-<ex>built</ex> castle</as>.</def>

<h1>Air cell</h1> <Xpage=35>

<hw>Air" cell`</hw> <tt>(#)</tt>. <p><b>1.</b> <fld>(Bot.)</fld> <def>A cavity in the cellular tissue of plants, containing air only.</def>

<p><b>2.</b> <fld>(Anat.)</fld> <def>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.</def>

<h1>Air chamber</h1> <Xpage=35>

<hw>Air" cham`ber</hw> <tt>(#)</tt>. <p><b>1.</b> <def>A chamber or cavity filled with air, in an animal or plant.</def>

<p><b>2.</b> <def>A cavity containing air to act as a spring for equalizing the flow of a liquid in a pump or other hydraulic machine.</def>