/ Dictionary / Index M mossback: Meaning and Definition of Find definitions for: moss•back Pronunciation: (môs'bak", mos'-), [key] — n. a person holding very antiquated notions; reactionary. a person living in the backwoods; rustic. an old turtle. a large and old fish, as a bass. a wild bull or cow. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mossback (Thesaurus) moss animal Mössbauer Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language