Definition of maniac noun from the Oxford Advanced American Dictionary



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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
maniacadjective[only before noun]
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a maniac driver/fan/killer

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