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]