01 a. Of or pertaining to the uropygium, or prominence at the base of the tail feathers, in birds.
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1.
Of or pertaining to the uropygium, or prominence at the base of the tail feathers, in birds.(Anat.)
Phrases & compounds
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.