/ Dictionary / Index M monophosphate: Meaning and Definition of Find definitions for: mon•o•phos•phate Pronunciation: (mon"u-fos'fāt), [key] — n. Chem. a salt containing only one phosphate group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. monophony monophthong Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language