DICT.TW Dictionary Taiwan

 uro·py·gi·um /ˌjʊrəˈpaɪʤiəm/
 尾臀

 U·ro·pyg·i·um n.  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.
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 uropygium
      n : posterior part of a bird's body from which the tail feathers
          grow