[ sahy-koh ]
/ ˈsaɪ koʊ /
noun, plural psy·chos.
a psychopathic or psychotic person.
a crazy or mentally unstable person.
psychopathic or psychotic.
crazy; mentally unstable.
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Origin of psycho
First recorded in 1935–40; by shortening
Definition for psycho (2 of 2)
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. 2020
British Dictionary definitions for psycho (1 of 2)
/ (ˈsaɪkəʊ) /
noun, adjective plural -chos
an informal and offensive word for psychopath or psychopathicSee psychopath
British Dictionary definitions for psycho (2 of 2)
sometimes before a vowel psych-
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)
[ sī′kō ]
Medical definitions for psycho (2 of 2)
Mental activities or processes:psychomotor.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.