mental illness

noun
any of the various forms of psychosis or severe neurosis.
Also called mental disorder, mental disease.

Origin:
1960–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
mental disorder
 
—n
law (in England, according to the Mental Health Act 1983) mental illness, arrested or incomplete development of mind, psychopathic disorder, or any other disorder or disability of the mind
 
mentally disordered
 
—adj

00:10
mental disorder is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a stew of meat, vegetables, potatoes, etc.
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mental illness
 
—n
any of various disorders in which a person's thoughts, emotions, or behaviour are so abnormal as to cause suffering to himself, herself, or other people

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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American Heritage
Medical Dictionary

mental disorder n.
See mental illness.

mental illness n.
Any of various disorders characterized chiefly by abnormal behavior or an inability to function socially, including diseases of the mind and personality and certain diseases of the brain. Also called mental disease, mental disorder.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
mental illness   (měn'tl)  Pronunciation Key 
Any of various psychiatric disorders or diseases, usually characterized by impairment of thought, mood, or behavior.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Your anger symptoms are not better accounted for by another mental disorder.
In extreme cases, the expression may be characterized as a mental disorder.
Millions of healthy people could be labeled with a mental disorder and treated with potentially dangerous drugs, some say.
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