9 Grammatical Pitfalls


[sahy-koh] /ˈsaɪ koʊ/ Slang.
noun, plural psychos.
a psychopathic or psychotic person.
a crazy or mentally unstable person.
psychopathic or psychotic.
crazy; mentally unstable.
Origin of psycho
1935-40; by shortening


a combining form representing psyche, (psychological) and psychological, (psychoanalysis) in compound words.
Also, especially before a vowel, psych-.
< Greek, combining form of psȳchḗ breath, spirit, soul, mind; akin to psȳ́chein to blow (see psykter) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for psycho
  • They'd rather have a rich neighbour than a crazy wacked out psycho next door too.
  • Nerds get what they want when they want it, and they go psycho if it's not immediately available.
  • Students and professors who experienced traumatic events raise the need for university psycho-social services.
  • Growing up in a society that reveres bad-boys with big guns makes you a psycho.
  • Thus the yogi will distinctly come to realize the simultaneous occurrence in pair of these psycho-physical phenomena.
  • There can be psycho-sociological and neurological explanations.
  • We no longer fear a single enemy bent on our psycho-political subjugation.
  • You'll have to ask someone who engages in this psycho stuff to talk about their emotions.
  • Not to put too fine a point on it, but he sounded psycho.
  • The rest was more of what you'd expect from the audition round: psycho rejects, bad-dancing wannabes and oblivious warblers.
British Dictionary definitions for psycho


noun, adjective (pl) -chos
an informal and offensive word for psychopath or psychopathic See psychopath


combining form
indicating the mind or psychological or mental processes: psychology, psychogenesis, psychosomatic
Word Origin
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
Cite This Source
Word Origin and History for psycho

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


1925, short for psychologist; as short for psychopath from 1942.


word-forming element meaning "mind, mental; spirit, unconscious," from Greek psykho-, combining form of psykhe (see psyche). It also was used to form compounds in Greek, e.g. psychopates "soul-beguiling."

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
psycho in Medicine

psycho psy·cho (sī'kō)
A psychopath. adj.
Crazy; insane.

psycho- or psych-

  1. Mind; mental: psychogenic.

  2. Mental activities or processes: psychomotor.

  3. Psychology; psychological: psychosocial.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Slang definitions & phrases for psycho



: a special psycho channel that I know nothing about


A crazy person; maniac; psychopath; nut: no buzzing broad, no nympho, no psycho, no bitch (1942+)

[probably fr psychotic; the form psychot, ''psychopath,'' is found by the 1940s]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
Cite This Source
Related Abbreviations for psycho


The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for psycho

Some English speakers likely know this word

Word Value for psycho

Scrabble Words With Friends

Quotes with psycho

Nearby words for psycho