psycho

[sahy-koh]Slang.
See more synonyms for psycho on Thesaurus.com
adjective
  1. psychopathic or psychotic.
  2. crazy; mentally unstable.

Origin of psycho

First recorded in 1935–40; by shortening

psycho-

  1. 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. 2018


Examples from the Web for psycho

Contemporary Examples of psycho

Historical Examples of psycho

  • Down the hall, a patient screamed suddenly in the psycho ward.

    Criminal Negligence

    Jesse Francis McComas

  • It was so in keeping with his features that it served to strengthen the psycho diagnosis.

    The Old Martians

    Roger Phillips Graham

  • Hell, don't you know any language but that psycho double-talk?

    The Planet Savers

    Marion Zimmer Bradley

  • Psycho wouldn't do you any good if you weren't, that's the truth.

    Dangerous Ages

    Rose Macaulay

  • Maybe he was psycho and they didn't notice; they had some godawful asses for psychiatrists in war medicine.

    The Brain

    Alexander Blade


British Dictionary definitions for psycho

psycho

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

psycho-

sometimes before a vowel psych-

combining form
  1. 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

Word Origin and History for psycho
adj.

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

n.

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

psycho-

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

psycho in Medicine

psycho

[sīkō]
n.
  1. A psychopath.
adj.
  1. Crazy; insane.

psycho-

pref.
  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.