/ Dictionary / Index M maniac: Meaning and Definition of Find definitions for: ma•ni•ac Pronunciation: (mā'nē-ak"), [key] — n. a raving or violently insane person; lunatic. any intemperate or overly zealous or enthusiastic person: a maniac when it comes to details. —adj. maniacal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: maniac (Thesaurus) mania maniacal 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