/ Dictionary / Index M megalomaniac: Meaning and Definition of Find definitions for: meg•a•lo•ma•ni•ac Pronunciation: (meg"u-lō-mā'nē-ak"), [key] — n. a person afflicted with megalomania. —adj. of, pertaining to, or suggesting megalomania or a person who is afflicted with it. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: megalomaniac (Thesaurus) megalomania megalopolis Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language