uro·py·gi·al gland
| \ ˌyu̇r-ə-ˈpī-jē-əl-
\
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Definition of uropygial gland
: a large gland that occurs in most birds, opens dorsally at the base of the tail feathers, and usually secretes an oily fluid which the bird uses in preening its feathers
— called also oil gland
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“Uropygial gland.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/uropygial%20gland. Accessed 22 Jan. 2022.
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Time Traveler for uropygial gland
The first known use of uropygial gland was in 1870
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