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psycho

[ sahy-koh ]
/ ˈsaɪ koʊ /
Slang.
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See synonyms for: psycho / psychos on Thesaurus.com

noun, plural psy·chos.
a psychopathic or psychotic person.
a crazy or mentally unstable person.
adjective
psychopathic or psychotic.
crazy; mentally unstable.
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Origin of psycho

First recorded in 1935–40; by shortening

Other definitions for psycho (2 of 2)

psycho-

a combining form representing psyche (psychological) and psychological (psychoanalysis) in compound words.
Also especially before a vowel, psych-.

Origin of psycho-

<Greek, combining form of psȳchḗ breath, spirit, soul, mind; akin to psȳ́chein to blow (see psykter)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use psycho in a sentence

British Dictionary definitions for psycho (1 of 2)

psycho
/ (ˈsaɪkəʊ) /

noun, adjective plural -chos
an informal and offensive word for psychopath or psychopathicSee psychopath

British Dictionary definitions for psycho (2 of 2)

psycho-

sometimes before a vowel psych-


combining form
indicating the mind or psychological or mental processespsychology; psychogenesis; psychosomatic

Word Origin for psycho-

from Greek psukhē spirit, breath
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for psycho (1 of 2)

psycho
[ sīkō ]

n.
A psychopath.
adj.
Crazy; insane.

Medical definitions for psycho (2 of 2)

psycho-

pref.
Mind; mental:psychogenic.
Mental activities or processes:psychomotor.
Psychology; psychological:psychosocial.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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