Medicine/Medical. malfunctioning, as of an organ or structure of the body.
any malfunctioning part or element: the dysfunctions of the country's economy.
Sociology. a consequence of a social practice or behavior pattern that undermines the stability of a social system.

1915–20; dys- + function

dysfunctional, adjective
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World English Dictionary
dysfunction (dɪsˈfʌŋkʃən)
1.  med any disturbance or abnormality in the function of an organ or part
2.  (esp of a family) failure to show the characteristics or fulfil the purposes accepted as normal or beneficial

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Word Origin & History

1916, from dys- "bad, abnormal, difficult" + function.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dysfunction dys·func·tion or dis·func·tion (dĭs-fŭngk'shən)
Abnormal or impaired functioning, especially of a bodily system or organ.

dys·func'tion·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Radial nerve dysfunction is a problem with the radial nerve.
The real dysfunction began after a pool of candidates had been identified.
Some third effect could be triggering both the symptoms of autism and the
  mitochondrial dysfunction.
These findings lend credence to the concept that serotonin dysfunction plays a
  role in the disorder.
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