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psychosis

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psy⋅cho⋅sis

[sahy-koh-sis]
–noun, plural -ses [-seez] .
1. a mental disorder characterized by symptoms, such as delusions or hallucinations, that indicate impaired contact with reality.
2. any severe form of mental disorder, as schizophrenia or paranoia.

Origin:
1840–50; < LGk psȳ́chōsis animation, principle of life. See psych-, -osis
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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psy·cho·sis   (sī-kō'sĭs)   
n.   pl. psy·cho·ses (-sēz)
A severe mental disorder, with or without organic damage, characterized by derangement of personality and loss of contact with reality and causing deterioration of normal social functioning.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Cultural Dictionary

psychosis [(seye-koh-sis)]

A severe mental disorder, more serious than neurosis, characterized by disorganized thought processes, disorientation in time and space, hallucinations, and delusions. Paranoia, manic depression, megalomania, and schizophrenia are all psychoses. One who suffers from psychosis is psychotic.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

psychosis 
1847, "mental derangement," from Gk. psykhe- "mind" (see psyche) + Mod.L. -osis "abnormal condition." Gk. psykhosis meant "animation, principle of life."
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: psy·cho·sis
Pronunciation: sI-'kO-s&s
Function: noun
Inflected Form: plural psy·cho·ses /-"sEz/
: a serious mental disorder (as schizophrenia) characterized by defective or lost contact with reality often with hallucinations or delusions
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

psychosis psy·cho·sis (sī-kō'sĭs)
n. pl. psy·cho·ses (-sēz)
A severe mental disorder, with or without organic damage, characterized by derangement of personality and loss of contact with reality and causing deterioration of normal social functioning.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
psychosis   (sī-kō'sĭs)  Pronunciation Key 
Plural psychoses (sī-kō'sēz)
A mental state caused by psychiatric or organic illness, characterized by a loss of contact with reality and an inability to think rationally. A psychotic person often behaves inappropriately and is incapable of normal social functioning.

psychotic adjective (sī-kŏt'ĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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