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