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!
Definitions on the go
Look up any word in the dictionary offline, anytime, anywhere with the Oxford Advanced Learner’s Dictionary app.
See psycho in the Oxford Advanced Learner's Dictionary
Check pronunciation: psycho