GNU Collaborative International Dictionary of English

Found one definition

      
Catechin (?), 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]

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