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Definition of WING
a: one of the movable feathered or membranous paired appendages by means of which a bird, bat, or insect is able to fly; also: such an appendage even though rudimentary if possessed by an animal belonging to a group characterized by the power of flight
b: any of various anatomical structures (as of a flying fish or flying lemur) providing means of limited flight
: an appendage or part resembling a wing in appearance, position, or function: as
a: a device worn under the arms to aid a person in swimming or staying afloat
In zoology, one of the paired structures certain animals use for flying. Bat and bird wings are modifications of the vertebrate forelimb. In birds, the fingers are reduced and the forearm is lengthened. The primary flight feathers propel the bird forward, and the secondaries (on the upper wing) provide lift. Bat wings consist of a membrane stretched over slender, elongated arm and hand bones. Insect wings are folds of integument (skin). Most insects have two pairs of wings; dipterans (flies) have only one developed pair, and beetles have two but use only one for flying. The two wings on a side usually move together, but dragonfly wings work independently.