psy·cho

[sahy-koh] noun, plural psy·chos, adjective Slang.
noun
1.
a psychopathic or psychotic person.
2.
a crazy or mentally unstable person.
adjective
3.
psychopathic or psychotic.
4.
crazy; mentally unstable.

Origin:
1935–40; by shortening

00:10
Psycho is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Dictionary.com Unabridged

psycho-

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


Origin:
< Greek, combining form of psȳchḗ breath, spirit, soul, mind; akin to psȳ́chein to blow (see psykter)

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
psycho (ˈsaɪkəʊ) [Click for IPA pronunciation guide]
 
n, —adj , pl -chos
See psychopath an informal and offensive word for psychopath or psychopathic

psycho- or (sometimes before a vowel) psych-
 
combining form
indicating the mind or psychological or mental processes: psychology; psychogenesis; psychosomatic
 
[from Greek psukhē spirit, breath]
 
psych- or (sometimes before a vowel) psych-
 
combining form
 
[from Greek psukhē spirit, breath]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

psycho
1927 (adj.), shortening of psychological; 1936 as shortening of psychopathic (adj.). The noun , short for psychopath, is attested from 1942.

psycho-
comb. form meaning "mind, mental," from Gk. psykho-, combining form of psykhe (see psyche).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

psycho- or psych-
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.
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Slang Dictionary

psycho definition


  1. n.
    a psychopathic person; a crazy person. : Pat is turning into a real psycho.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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American Heritage
Abbreviations & Acronyms
psycho
psychopath
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The rest was more of what you'd expect from the audition round: psycho rejects, bad-dancing wannabes and oblivious warblers.
Growing up in a society that reveres bad-boys with big guns makes you a psycho.
Not to put too fine a point on it, but he sounded psycho.
You'll have to ask someone who engages in this psycho stuff to talk about their emotions.
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