/ Dictionary / Index M maniacal: Meaning and Definition of Find definitions for: ma•ni•a•cal Pronunciation: (mu-nī'u-kul), [key] — adj. of or pertaining to mania or a maniac. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: maniacal (Thesaurus) maniac manic 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