/ Dictionary / Index D Du Quoin: Meaning and Definition of Find definitions for: Du Quoin Pronunciation: (d koin'), [key] a town in SW Illinois: site of the Hambletonian. 6594. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Duquesne dur* Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language