/ Dictionary / Index Q quinoxaline: Meaning and Definition of Find definitions for: quin•ox•a•line Pronunciation: (kwi-nok'su-lēn", -lin), [key] — n. Chem. a colorless, crystalline, water-soluble powder, CHN, used chiefly in organic synthesis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quinonoid quinq. Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language