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2 definitions found
 for Air valve
From The Collaborative International Dictionary of English v.0.48 :

  Valve \Valve\, n. [L. valva the leaf, fold, or valve of a door:
     cf. F. valve.]
     [1913 Webster]
     1. A door; especially, one of a pair of folding doors, or one
        of the leaves of such a door.
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              Swift through the valves the visionary fair
              Repassed.                             --Pope.
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              Heavily closed, . . . the valves of the barn doors.
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     2. A lid, plug, or cover, applied to an aperture so that by
        its movement, as by swinging, lifting and falling,
        sliding, turning, or the like, it will open or close the
        aperture to permit or prevent passage, as of a fluid.
        [1913 Webster]
     Note: A valve may act automatically so as to be opened by the
           effort of a fluid to pass in one direction, and closed
           by the effort to pass in the other direction, as a
           clack valve; or it may be opened or closed by hand or
           by mechanism, as a screw valve, or a slide valve.
           [1913 Webster]
     3. (Anat.) One or more membranous partitions, flaps, or
        folds, which permit the passage of the contents of a
        vessel or cavity in one direction, but stop or retard the
        flow in the opposite direction; as, the ileocolic, mitral,
        and semilunar valves.
        [1913 Webster]
     4. (Bot.)
        (a) One of the pieces into which a capsule naturally
            separates when it bursts.
        (b) One of the two similar portions of the shell of a
        (c) A small portion of certain anthers, which opens like a
            trapdoor to allow the pollen to escape, as in the
            [1913 Webster]
     5. (Zool.) One of the pieces or divisions of bivalve or
        multivalve shells.
        [1913 Webster]
     Air valve, Ball valve, Check valve, etc. See under
        Air. Ball, Check, etc.
     Double-beat valve, a kind of balance valve usually
        consisting of a movable, open-ended, turban-shaped shell
        provided with two faces of nearly equal diameters, one
        above another, which rest upon two corresponding seats
        when the valve is closed.
     Equilibrium valve.
        (a) A balance valve. See under Balance.
        (b) A valve for permitting air, steam, water, etc., to
            pass into or out of a chamber so as to establish or
            maintain equal pressure within and without.
     Valve chest (Mach.), a chamber in which a valve works;
        especially (Steam Engine), the steam chest; -- called in
        England valve box, and valve casing. See Steam
        chest, under Steam.
     Valve face (Mach.), that part of the surface of a valve
        which comes in contact with the valve seat.
     Valve gear, or Valve motion (Steam Engine), the system of
        parts by which motion is given to the valve or valves for
        the distribution of steam in the cylinder. For an
        illustration of one form of valve gear, see Link motion.
     Valve seat. (Mach.)
        (a) The fixed surface on which a valve rests or against
            which it presses.
        (b) A part or piece on which such a surface is formed.
     Valve stem (Mach.), a rod attached to a valve, for moving
     Valve yoke (Mach.), a strap embracing a slide valve and
        connecting it to the valve stem.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Air \Air\ ([^a]r), n. [OE. air, eir, F. air, L. a["e]r, fr. Gr.
     'ah`r, air, mist, for 'a[digamma]hr, fr. root 'a[digamma] to
     blow, breathe, probably akin to E. wind. In sense 10 the
     French has taking a meaning fr. It. aria atmosphere, air, fr.
     the same Latin word; and in senses 11, 12, 13 the French
     meaning is either fr. L. aria, or due to confusion with F.
     aire, in an older sense of origin, descent. Cf. A["e]ry,
     Debonair, Malaria, Wind.]
     1. The fluid which we breathe, and which surrounds the earth;
        the atmosphere. It is invisible, inodorous, insipid,
        transparent, compressible, elastic, and ponderable.
        [1913 Webster]
     Note: By the ancient philosophers, air was regarded as an
           element; but modern science has shown that it is
           essentially a mixture of oxygen and nitrogen, with a
           small amount of carbon dioxide, the average proportions
           being, by volume: oxygen, 20.96 per cent.; nitrogen,
           79.00 per cent.; carbon dioxide, 0.04 per cent. These
           proportions are subject to a very slight variability.
           Air also always contains some vapor of water.
           [1913 Webster]
     2. Symbolically: Something unsubstantial, light, or volatile.
        "Charm ache with air." --Shak.
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              He was still all air and fire. [Air and fire being
        the finer and quicker elements as opposed to earth and
        water.]                                     --Macaulay
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     3. A particular state of the atmosphere, as respects heat,
        cold, moisture, etc., or as affecting the sensations; as,
        a smoky air, a damp air, the morning air, etc.
        [1913 Webster]
     4. Any a["e]riform body; a gas; as, oxygen was formerly
        called vital air. [Obs.]
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     5. Air in motion; a light breeze; a gentle wind.
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              Let vernal airs through trembling osiers play.
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     6. Odoriferous or contaminated air.
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     7. That which surrounds and influences.
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              The keen, the wholesome air of poverty.
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     8. Utterance abroad; publicity; vent.
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              You gave it air before me.            --Dryden.
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     9. Intelligence; information. [Obs.] --Bacon.
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     10. (Mus.)
         (a) A musical idea, or motive, rhythmically developed in
             consecutive single tones, so as to form a symmetrical
             and balanced whole, which may be sung by a single
             voice to the stanzas of a hymn or song, or even to
             plain prose, or played upon an instrument; a melody;
             a tune; an aria.
         (b) In harmonized chorals, psalmody, part songs, etc.,
             the part which bears the tune or melody -- in modern
             harmony usually the upper part -- is sometimes called
             the air.
             [1913 Webster]
     11. The peculiar look, appearance, and bearing of a person;
         mien; demeanor; as, the air of a youth; a heavy air; a
         lofty air. "His very air." --Shak.
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     12. Peculiar appearance; apparent character; semblance;
         manner; style.
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               It was communicated with the air of a secret.
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     12. pl. An artificial or affected manner; show of pride or
         vanity; haughtiness; as, it is said of a person, he puts
         on airs. --Thackeray.
         [1913 Webster]
     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.
             [1913 Webster]
     15. (Man.) The artificial motion or carriage of a horse.
         [1913 Webster]
     Note: 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.
           [1913 Webster]
     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 spring, a spring in which the elasticity of air is
     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
         (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.
     on the air, currently transmitting; live; -- used of radio
        and television broadcasts, to indicate that the images and
        sounds being picked up by cameras and microphones are
        being broadcast at the present moment.
     Note: In call-in programs where individuals outside a radio
           or television studio have telephoned into the station,
           when their voice is being directly broadcast, the host
           of the program commonly states "You're on the air." as
           a warning that the conversation is not private.
     To take air, to be divulged; to be made public.
     To take the air, to go abroad; to walk or ride out.
        [1913 Webster]

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