/ Dictionary / Index M moraine: Meaning and Definition of Find definitions for: mo•raine Pronunciation: (mu-rān'), [key] — n. a ridge, mound, or irregular mass of unstratified glacial drift, chiefly boulders, gravel, sand, and clay. a deposit of such material left on the ground by a glacier. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: moraine (Thesaurus) Moraga moral 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