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uropygium 尾臀 尾臀 uropygium n 1: posterior part of a bird's body from which the tail feathers grow Uropygium \U`ro*pyg"i*um\, n. [NL., fr. Gr. ?, (corrupted form)
?; ? the end of the os sacrum ? rump.] (Anat.) The prominence at the posterior extremity of a bird's body, which supports the feathers of the tail; the rump; -- sometimes called pope's nose. [1913 Webster]
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