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A yellow flavonol, C15H10O7, found in glycoside form in tea and in many vegetables and fruits. It is an antioxidant and is used as a dietary supplement for its supposed antihistaminic, anti-inflammatory, and antitumor properties.

[Latin quercētum, oak forest (from quercus, oak; see perkwu- in Indo-European roots) + -in.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈkwɜːsɪtɪn) or


(Elements & Compounds) a yellow crystalline pigment found naturally in the rind and bark of many plants. It is used in medicine to treat fragile capillaries. Formula: C15H10O7; melting pt: 316–7°C. Also called: flavin
[C19: from Latin quercētum an oak forest (from quercus an oak) + -in]
quercetic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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The synonyms for quercetin are: CI natural yellow 10; CI 75670; cyanidelonon 1522; flavin meletin; quercetine; quercitol; quertin; quertine; sophoretin; xanthaurine; 3,3',4',5,7-pentahydroxyflavone; 3,5,7,3',4'-pentahydroxyflavone; 2-(3,4- dihydroxyphenyl)-3,5,7-trihydroxy-4H-1-benzopyran-4-one.