uropygial gland
noun
uro·py·gi·al gland
ˌyu̇r-ə-ˈpī-jē-əl- 
: 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 30 Nov. 2024.
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