/ Dictionary / Index Q quercetin: Meaning and Definition of Find definitions for: quer•ce•tin Pronunciation: (kwûr'si-tin), [key] — n. Chem. a yellow, crystalline, slightly water-soluble powder, CHO, obtained from the bark of the quercitron and other vegetable substances, used as a yellow dye; flavin. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Quentin Quercia Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language