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1 One of the inner flight feathers of a bird, located on the trailing edge of the wing between the body and the bend of the wing.

2 Applied to structures (e.g. the limbs of snakes, the wings of insects) that have been lost in the course of evolution, and to structures or forms (e.g. bilateral symmetry in Nudibranchia) that have developed.

Subjects: Zoology and Animal Sciences.

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