/ Dictionary / Index M megalith: Meaning and Definition of Find definitions for: meg•a•lith Pronunciation: (meg'u-lith), [key] — n. a stone of great size, esp. in ancient construction work, as the Cyclopean masonry, or in prehistoric Neolithic remains, as dolmens or menhirs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megalith (Thesaurus) -megalia megalithic astronomy Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language