from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A large gland at the base of a bird's tail that secretes an oil used in preening.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
secretory organ, at the base of a bird's tail, that secretes the oilused in preening.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun oil-secreting gland situated at the base of the tail in most birds
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