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From 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]