uropygium

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uropygium

(yo͝or′ə-pī′jē-əm, -pĭj′ē-)
n.
The posterior part of a bird's body, from which the tail feathers grow.

u′ro·py′gi·al (-əl) adj.

uropygium

the fleshy and bony swelling at the rear of a bird that supports the tail feathers.