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psycho (adj.)

1927, shortening of psychological; 1936 (Raymond Chandler) as shortening of psychopathic (adj.).

psycho (n.)

1925 as short for psychologist; (earlier short for psychology, 1921); as short for psychopath by 1942.

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Definitions of psycho from WordNet

psycho (n.)
a person afflicted with psychosis;
Synonyms: psychotic / psychotic person
From wordnet.princeton.edu