Dictionary.com

psycho

[ sahy-koh ]
/ ˈsaɪ koʊ /
Slang.
Save This Word!
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.
QUIZ
QUIZ YOURSELF ON AFFECT VS. EFFECT!
In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

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.
FEEDBACK