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noun Chemistry.
  1. a yellow, crystalline, slightly water-soluble powder, C15H10O7, obtained from the bark of the quercitron and other vegetable substances, used as a yellow dye; flavin.
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Origin of quercetin

1855–60; < New Latin quercēt(um) an oak grove (Latin querc(us) oak (see quercine) + -ētum suffix of places where a given plant grows) + -in2
Also called meletin.
Related formsquer·cet·ic [kwer-set-ik, -see-tik] /kwərˈsɛt ɪk, -ˈsi tɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for quercetin



  1. a yellow crystalline pigment found naturally in the rind and bark of many plants. It is used in medicine to treat fragile capillaries. Formula: C 15 H 10 O 7; melting pt: 316–7°CAlso called: flavin
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Derived Formsquercetic (kwɜːˈsɛtɪk, -ˈsiː-), adjective

Word Origin

C19: from Latin quercētum an oak forest (from quercus an oak) + -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

quercetin in Medicine


  1. A yellow powdered crystalline compound produced synthetically or occurring as a glycoside in the rind and bark of numerous plants, used medicinally to treat abnormal capillary fragility.meletin
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.