/ Dictionary / Index M MSD: Meaning and Definition of Find definitions for: MSD Pronunciation: [key] See M.S.D. Pronunciation: [key] Doctor of Medical Science. Master of Science in Dentistry. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. M.S.C.P. M.S.Dent. Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language