/ Dictionary / Index M M.H.W.: Meaning and Definition of Find definitions for: M.H.W. Pronunciation: [key] mean high water. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. M.H.R. MHz Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language