MANIAC Meaning of MANIAC in English [ma.ni.ac] n [LL maniacus maniacal, fr. Gk maniakos, fr. mania] (ca. 1763) 1: madman, lunatic 2: a person characterized by an inordinate or ungovernable enthusiasm for something Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012