/ Dictionary / Index M moss-grown: Meaning and Definition of Find definitions for: moss-grown Pronunciation: (môs'grōn", mos'-), [key] — adj. overgrown with moss. old-fashioned; antiquated: moss-grown traditions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: moss-grown (Thesaurus) moss green moss hag 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