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

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

First Known Use: 1771

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