U`ro*pyg"i*al(?), a. [See Uropygium.] (Anat.) Of or pertaining to the uropygium, or prominence at the base of the tail feathers, in birds.
Uropygial gland, a peculiar sebaceous gland at the base of the tail feathers in most birds. It secretes an oily fluid which is spread over the feathers by preening.
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.
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Wed 19th December 2018