Collins
World English Dictionary
affective disorder
 
n
any mental disorder, such as depression or mania, that is characterized by abnormal disturbances of mood

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

affective disorder n.
Any of a group of disorders characterized by a prolonged, pervasive disturbance of mood together with a full or partial manic or depressive response that is not caused by a separate physical or 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
affective disorder   (ə-fěk'tĭv)  Pronunciation Key 
See mood disorder.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Seasonal affective disorder may be seen as helpful when spending winters in a confined situation such as cave-dwelling.
More than any other wine, rosés suffer from a sort of seasonal affective disorder.
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