uropygium

noun

uro·py·gi·um | \ˌyu̇r-ə-ˈpī-jē-əm

\

Definition of uropygium

: the fleshy and bony prominence at the posterior extremity of a bird's body that supports the tail feathers

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uropygial gland

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The first known use of uropygium was in 1771

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