idiopathic

[id-ee-uh-path-ik]
adjective Pathology.
of unknown cause, as a disease.

Origin:
1660–70; idio- + -pathic

idiopathically, adverb
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World English Dictionary
idiopathy (ˌɪdɪˈɒpəθɪ)
 
n , pl -thies
any disease of unknown cause
 
idiopathic
 
adj

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

idiopathic id·i·o·path·ic (ĭd'ē-ə-pāth'ĭk)
adj.

  1. Of or relating to a disease having no known cause; agnogenic.

  2. Of or relating to a disease that is not the result of any other disease.

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
idiopathic   (ĭd'ē-ə-pāth'ĭk)  Pronunciation Key 
Relating to or being a disease having no known cause.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Idiopathic aplastic anemia is a condition in which the bone marrow fails to
  properly make blood cells.
We need to get clear that many idiopathic diseases are related to acidity and
  dehydration.
He had been suffering from idiopathic pulmonary fibrosis, a progressive and
  fatal scarring of the lungs.
In this case, the condition is called idiopathic pericarditis.
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