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 for wing cover
From The Collaborative International Dictionary of English v.0.48 :

  Wing \Wing\, n. [OE. winge, wenge; probably of Scand. origin;
     cf. Dan. & Sw. vinge, Icel. v[ae]ngr.]
     [1913 Webster]
     1. One of the two anterior limbs of a bird, pterodactyl, or
        bat. They correspond to the arms of man, and are usually
        modified for flight, but in the case of a few species of
        birds, as the ostrich, auk, etc., the wings are used only
        as an assistance in running or swimming.
        [1913 Webster]
              As an eagle stirreth up her nest, fluttereth over
              her young, spreadeth abroad her wings, taketh them,
              beareth them on her wings.            --Deut. xxxii.
        [1913 Webster]
     Note: In the wing of a bird the long quill feathers are in
           series. The primaries are those attached to the ulnar
           side of the hand; the secondaries, or wing coverts,
           those of the forearm: the scapulars, those that lie
           over the humerus; and the bastard feathers, those of
           the short outer digit. See Illust. of Bird, and
           [1913 Webster]
     2. Any similar member or instrument used for the purpose of
        flying. Specifically: (Zool.)
        (a) One of the two pairs of upper thoracic appendages of
            most hexapod insects. They are broad, fanlike organs
            formed of a double membrane and strengthened by
            chitinous veins or nervures.
        (b) One of the large pectoral fins of the flying fishes.
            [1913 Webster]
     3. Passage by flying; flight; as, to take wing.
        [1913 Webster]
              Light thickens; and the crow
              Makes wing to the rooky wood.         --Shak.
        [1913 Webster]
     4. Motive or instrument of flight; means of flight or of
        rapid motion.
        [1913 Webster]
              Fiery expedition be my wing.          --Shak.
        [1913 Webster]
     5. Anything which agitates the air as a wing does, or which
        is put in winglike motion by the action of the air, as a
        fan or vane for winnowing grain, the vane or sail of a
        windmill, etc.
        [1913 Webster]
     6. An ornament worn on the shoulder; a small epaulet or
        shoulder knot.
        [1913 Webster]
     7. Any appendage resembling the wing of a bird or insect in
        shape or appearance. Specifically:
        (a) (Zool.) One of the broad, thin, anterior lobes of the
            foot of a pteropod, used as an organ in swimming.
        (b) (Bot.) Any membranaceous expansion, as that along the
            sides of certain stems, or of a fruit of the kind
            called samara.
        (c) (Bot.) Either of the two side petals of a
            papilionaceous flower.
            [1913 Webster]
     8. One of two corresponding appendages attached; a sidepiece.
        (a) (Arch.) A side building, less than the main edifice;
            as, one of the wings of a palace.
        (b) (Fort.) The longer side of crownworks, etc.,
            connecting them with the main work.
        (c) (Hort.) A side shoot of a tree or plant; a branch
            growing up by the side of another. [Obs.]
        (d) (Mil.) The right or left division of an army,
            regiment, etc.
        (e) (Naut.) That part of the hold or orlop of a vessel
            which is nearest the sides. In a fleet, one of the
            extremities when the ships are drawn up in line, or
            when forming the two sides of a triangle. --Totten.
        (f) One of the sides of the stags in a theater.
            [1913 Webster]
     9. (Aeronautics) Any surface used primarily for supporting a
        flying machine in flight, especially the flat or slightly
        curved planes on a heavier-than-air aircraft which provide
        most of the lift. In fixed-wing aircraft there are usually
        two main wings fixed on opposite sides of the fuselage.
        Smaller wings are typically placed near the tail primarily
        for stabilization, but may be absent in certain kinds of
        aircraft. Helicopters usually have no fixed wings, the
        lift being supplied by the rotating blade.
     10. One of two factions within an organization, as a
         political party, which are opposed to each other; as,
         right wing or left wing.
     11. An administrative division of the air force or of a naval
         air group, consisting of a certain number of airplanes
         and the personnel associated with them.
     On the wing.
         (a) Supported by, or flying with, the wings another.
     On the wings of the wind, with the utmost velocity.
     Under the wing of, or Under the wings of, under the care
        or protection of.
     Wing and wing (Naut.), with sails hauled out on either
        side; -- said of a schooner, or her sails, when going
        before the wind with the foresail on one side and the
        mainsail on the other; also said of a square-rigged vessel
        which has her studding sails set. Cf. Goosewinged.
     Wing case (Zool.), one of the anterior wings of beetles,
        and of some other insects, when thickened and used to
        protect the hind wings; an elytron; -- called also wing
     Wing covert (Zool.), one of the small feathers covering the
        bases of the wing quills. See Covert, n., 2.
     Wing gudgeon (Mach.), an iron gudgeon for the end of a
        wooden axle, having thin, broad projections to prevent it
        from turning in the wood. See Illust. of Gudgeon.
     Wing shell (Zool.), wing case of an insect.
     Wing stroke, the stroke or sweep of a wing.
     Wing transom (Naut.), the uppermost transom of the stern;
        -- called also main transom. --J. Knowles.
        [1913 Webster]

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