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n. pl. pa·ta·gi·a (-jē-ə)
1. A thin membrane extending between the body and a limb to form a wing or winglike extension, as in bats and flying squirrels.
2. An expandable membranous fold of skin between the wing and body of a bird.
[Latin patagium, gold edging on a woman's tunic, perhaps from Greek *patageion, from patagos, clatter, of imitative origin .]
pa·ta′gi·al (-jē-əl) adj.
(Zoology) zoology of or relating to a patagium