uropygium Meaning, Definition & Usage

  1. noun posterior part of a bird's body from which the tail feathers grow

WordNet

U`ro*pyg"i*um noun
Etymology
NL., fr. Gr. , (corrupted form) the end of the os sacrum + rump.
Definitions
  1. (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.

Webster 1913