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A type of Chinese green tea with twisted leaves.
[Ultimately (perhaps via Dutch or French) from Cantonese hei1 ceon1; akin to Mandarin xī chūn : xī, bright (from Middle Chinese xi) + xūn, spring (from Middle Chinese tʂyn).]
(Cookery) a Chinese green tea, the early crop of which is known as young hyson and the inferior leaves as hyson skin
[C18: from Chinese (Cantonese) hei-ch'un bright spring]