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The Collaborative International Dictionary of English v.0.48:

Catechin \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. [1913 Webster +PJC]