catechin

Apples contain an anti-inflammatory flavonoid called quercetin, while red wine contains the flavonoid catechin.
10 Power Food Combos|Divya Gugnani|March 18, 2010|DAILY BEAST
It contains a crystallisable principle (margosine) and an astringent principle (catechin).
Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I|Arnold Cooley
It contains 60 % of tanning matter and a large proportion of catechin similar to that contained in gambier, but much redder.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 3|Various
It contains two coloring principles, catechin and catechu-tannic acid.
Principles and Practice of Fur Dressing and Fur Dyeing|William E. Austin

Catechu tannin and catechin are compounds of the catechol tannin type.
The Chemistry of Plant Life|Roscoe Wilfred Thatcher

British Dictionary definitions for catechin

catechin

/ (ˈkætəkɪn) /

noun

a soluble yellow solid substance found in catechu and mahogany wood and used in tanning and dyeing. Formula: C 15 H 14 O 6

Word Origin for catechin

C19: from catechu + -in

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012