Meaning of uropygial gland

uropyg'ial gland"

Pronunciation: [key]
— Ornith. Ornith.
  1. a gland opening on the back at the base of the tail in most birds that secretes an oily fluid used by the bird in preening its feathers. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.