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

First Known Use of uropygium

1771, in the meaning defined above

History and Etymology for uropygium

New Latin, from Greek ouropygion, from ouro- ur- entry 2 + pygē rump

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The first known use of uropygium was in 1771

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