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From: Webster's Revised Unabridged Dictionary (1913)

 Cat·e·chin n. Chem. One of the tannic acids (C15H14O6), extracted from catechu as a white, crystalline substance; -- called also catechuic acid, catechinic acid, cyanidol, and catechuin.  It is a flavonoid found generally in higher woody plants, and is used in dyeing and tanning.
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