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Webster 1913 Edition
Uropygium
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Uˊro-pyg′i-um
,Noun.
[NL., fr. Gr. [GREEK], (corrupted form) [GREEK]; [GREEK] the end of the os sacrum + [GREEK] 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.