American English

Definition of psycho noun from the Oxford Advanced American Dictionary

 

psycho

 noun
noun
NAmE//ˈsaɪkoʊ//
 
(pl. psychos) (informal)
 
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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!
psycho adjective
 
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See the Oxford Advanced Learner's Dictionary entry: psycho

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