/ Dictionary / Index M mordant rouge: Meaning and Definition of Find definitions for: mor'dant rouge' Pronunciation: [key] a solution of aluminum acetate in acetic acid, used in dyeing and calico printing. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mordant Mordecai Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language