GNU Collaborative International Dictionary of English

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1.       
   ‖Uropygium , 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