Definition of maniac noun from the Oxford Advanced Learner's Dictionary

     

    maniac

     noun
    noun
    BrE BrE//ˈmeɪniæk//
     
    ; NAmE NAmE//ˈmeɪniæk//
     
     
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  1. 1(informal) a person who behaves in an extremely dangerous, wild or stupid way synonym madman He was driving like a maniac.
  2. 2a person who has an extremely strong desire or enthusiasm for something, to an extent that other people think is not normal synonym fanatic
  3. 3(psychology) a person suffering from mania a homicidal maniac
  4. Word Origin early 16th cent. (as an adjective): via late Latin from late Greek maniakos, from mania ‘madness’, from mainesthai ‘be mad’.