a brown or amber tea grown in China and Taiwan and partially fermented before being dried.
literally, black dragon, or < a cognate dial. form
a kind of dark tea, grown in China, that is partly fermented before being dried
[C19: from Chinese
Collins English Dictionary - Complete & Unabridged 10th Edition
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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.