Dictionary
uropygial gland
noun uro·py·gi·al gland \ˌyu̇r-ə-ˈpī-jē-əl-\
Definition of UROPYGIAL GLAND
: a large gland that occurs in most birds, opens dorsally at the base of the tail feathers, and usually secretes an oily fluid which the bird uses in preening its feathers —called also oil gland
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First Known Use of UROPYGIAL GLAND
1870
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