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