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urography
urokinase
urol.
urolith
urolithiasis
urology
uropod
uropygial
uropygial gland
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uropygium
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uropygial gland
u·ro·py·gi·al gland (plural u·ro·py·gi·al glands)


noun 
Definition:
 
oil gland in birds: a gland in the skin at the base of the tail of most birds that secretes an oil used while preening to condition and waterproof the feathers
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