/ Dictionary / Index M matrass: Meaning and Definition of Find definitions for: mat•rass Pronunciation: (ma'trus), [key] — n. Chem. a rounded, long-necked glass container, formerly used for distilling and dissolving substances. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Matralia matri- 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