- 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.
Origin of uropygial gland
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a gland, situated at the base of the tail in most birds, that secretes oil used in preening