/ Dictionary / Index Q quinone: Meaning and Definition of Find definitions for: qui•none Pronunciation: (kwi-nōn', kwin'ōn), [key] — n. Chem. a yellow, crystalline, cyclic unsaturated diketone, CHO, formed by oxidizing aniline or hydroquinone: used chiefly in photography and in tanning leather. any of a class of compounds of this type. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: quinone (Thesaurus) quinoline quinone diimine Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language