Medical term:
uropygial
uropygium
(yo͝or′ə-pī′jē-əm, -pĭj′ē-)n.
The posterior part of a bird's body, from which the tail feathers grow.
u′ro·py′gi·al (-əl) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
uropygium
the fleshy and bony swelling at the rear of a bird that supports the tail feathers.Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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