/ Dictionary / Index M magnesium sulfate: Meaning and Definition of Find definitions for: magne'sium sul'fate Pronunciation: [key] a white, water-soluble salt, MgSO, used chiefly in medicine and in the processing of leather and textiles. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. magnesium silicate magnesium trisilicate 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