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. 2014.
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World English Dictionary
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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Word Origin & History

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- 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.
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