/ Dictionary / Index Q quoin: Meaning and Definition of Find definitions for: quoin Pronunciation: (koin, kwoin), [key] —v.t. to provide with quoins, as a corner of a wall. to secure or raise with a quoin or wedge. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: quoin (Thesaurus) quod vide quoit Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language