maniac

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ma·ni·ac / ˈmānēˌak/ • n. inf. a person exhibiting extreme symptoms of wild behavior, esp. when violent and dangerous: a homicidal maniac. ∎  an obsessive enthusiast: a gambling maniac. ∎  archaic Psychiatry a person suffering from mania.DERIVATIVES: ma·ni·a·cal / məˈnīəkəl/ adj.ma·ni·a·cal·ly / məˈnīək(ə)lē/ adv.

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