[oo-lawng, -long]
a brown or amber tea grown in China and Taiwan and partially fermented before being dried.

1850–55; < Chinese wúlóng literally, black dragon, or < a cognate dial. form

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World English Dictionary
oolong (ˈuːˌlɒŋ)
a kind of dark tea, grown in China, that is partly fermented before being dried
[C19: from Chinese wu lung, from wu black + lung dragon]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"dark variety of Chinese tea," 1852, from Chinese wu-lung, lit. "black dragon."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Oolong tea contains a mixture of simple polyphenols, such as catechins, and complex polyphenols.
Oolong tea does not improve glucose metabolism in non-diabetic adults.
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