Hypertext Webster Gateway: "Uropygium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
uropygium
n : posterior part of a bird's body from which the tail feathers
grow
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