/ Dictionary / Index M megalithic astronomy: Meaning and Definition of Find definitions for: megalith'ic astron'omy Pronunciation: [key] archaeoastronomy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. megalith megalo- 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