/ Dictionary / Index M magnesium trisilicate: Meaning and Definition of Find definitions for: magne'sium trisil'icate Pronunciation: [key] a white, fine, odorless and tasteless powder, MgOSi&multiplydot;nHO, used industrially to absorb odors and decolorize and pharmaceutically as an antacid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. magnesium sulfate magnet Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language