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uropygial gland

noun, Ornithology.
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 oil gland, preen gland.
Origin of uropygial gland
First recorded in 1865-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for uropygial gland

uropygial gland

a gland, situated at the base of the tail in most birds, that secretes oil used in preening
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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