uro·py·gi·um
| \ ˌyu̇r-ə-ˈpī-jē-əm
\
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Definition of uropygium
: the fleshy and bony prominence at the posterior extremity of a bird's body that supports the tail feathers
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“Uropygium.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/uropygium. Accessed 1 Jul. 2022.
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Time Traveler for uropygium
The first known use of uropygium was in 1771
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