/ Dictionary / Index M monosodium: Meaning and Definition of Find definitions for: mon•o•so•di•um Pronunciation: (mon"u-sō'dē-um), [key] — adj. Chem. containing one atom of sodium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monosepalous monosodium glutamate Related Content Daily Word Quiz: diurnal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language