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



BrE BrE//ˈsaɪkəʊ//
; NAmE NAmE//ˈsaɪkoʊ//
(pl. psychos) (informal) Describing strange traits
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a person who is mentally ill and who behaves in a very strange violent way In his new film, he plays the part of a crazed psycho. Don’t let him drive—he’s a complete psycho behind the wheel! See related entries: Describing strange traits Word Origin1930s: abbreviation.
See the Oxford Advanced American Dictionary entry: psycho