maniac

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ma·ni·ac

(mā'nē-ak), This imprecise term, which has pejorative connotations in lay use, is best avoided in medical speech and writing.
1. Obsolete term for a mentally ill or disturbed person.
2. One suffering from mania.

maniac

(1) An obsolete, nonspecific term for a person suffering from mania or any other form of mental illness. 
(2) A highly colloquial term that may be loosely applied to any person who is “mad” or “acts crazy” (especially in American English); lunatic.

maniac

one affected with mania.