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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

Origin and Etymology of uropygium

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

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First Known Use: 1771

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