1.
[syn: uropygial gland, preen gland]
The Collaborative International Dictionary of English v.0.48:
Uropygial \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.
[1913 Webster]
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.
[1913 Webster]
WordNet (r) 3.0 (2006):
uropygial gland
n 1: oil-secreting gland situated at the base of the tail in
most birds [syn: uropygial gland, preen gland]