uropygial gland[yo͝orˌə-pīˈjē-əl, -pĭjˈē-]
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a large gland located at the base of the tail in most birds, that secretes an oil used in preening
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A large gland at the base of a bird's tail that secretes an oil used in preening. Also called oil gland.