/ Dictionary / Index M M.F.S.: Meaning and Definition of Find definitions for: M.F.S. Pronunciation: [key] Master of Food Science. Master of Foreign Service. Master of Foreign Study. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mfs (Thesaurus) mfr. M.F.T. Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language