SINCE 1828
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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