id·i·o·path·ic

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

Origin:
1660–70; idio- + -pathic

id·i·o·path·i·cal·ly, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
idiopathy (ˌɪdɪˈɒpəθɪ) [Click for IPA pronunciation guide]
 
n , pl -thies
any disease of unknown cause
 
idiopathic
 
adj

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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00:10
Idiopathic is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
the offspring of a zebra and a donkey.
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
Essential hypertension is also known as primary or idiopathic hypertension.
Idiopathic autoimmune hemolytic anemia accounts for one-half of all immune
  hemolytic anemias.
We need to get clear that many idiopathic diseases are related to acidity and
  dehydration.
When the cause is unknown, it is referred to as idiopathic aplastic anemia.
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