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Air port
(gcide) | Port \Port\, n. [F. porte, L. porta, akin to portus; cf. AS.
porte, fr. L. porta. See Port a harbor, and cf. Porte.]
1. A passageway; an opening or entrance to an inclosed place;
a gate; a door; a portal. [Archaic]
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Him I accuse
The city ports by this hath entered. --Shak.
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Form their ivory port the cherubim
Forth issuing. --Milton.
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2. (Naut.) An opening in the side of a vessel; an embrasure
through which cannon may be discharged; a porthole; also,
the shutters which close such an opening.
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Her ports being within sixteen inches of the water.
--Sir W.
Raleigh.
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3. (Mach.) A passageway in a machine, through which a fluid,
as steam, water, etc., may pass, as from a valve to the
interior of the cylinder of a steam engine; an opening in
a valve seat, or valve face.
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Air port, Bridle port, etc. See under Air, Bridle,
etc.
Port bar (Naut.), a bar to secure the ports of a ship in a
gale.
Port lid (Naut.), a lid or hanging for closing the
portholes of a vessel.
Steam port, & Exhaust port (Steam Engine), the ports of
the cylinder communicating with the valve or valves, for
the entrance or exit of the steam, respectively.
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Air port
(gcide) | 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.
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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.
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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.
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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.
--Pope.
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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.
--Wordsworth.
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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.
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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.
--Pope.
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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.
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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.
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15. (Man.) The artificial motion or carriage of a horse.
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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.
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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.
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.
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