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idiopathy

[id-ee-op-uh-thee]
noun, plural id·i·op·a·thies.
  1. a disease not preceded or occasioned by any known morbid condition.

Origin of idiopathy

1630–40; < New Latin idiopathīa < Greek idiopátheia disease or affection of local origin. See idio-, -pathy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for idiopathy

idiopathy

noun plural -thies
  1. any disease of unknown cause
Derived Formsidiopathic (ˌɪdɪəʊˈpæθɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for idiopathy
n.

1640s, Modern Latin, from Greek idiopatheia, from comb. form of idios "one's own" (see idiom) + -patheia, comb. form of pathos "suffering, disease, feeling" (see pathos). Related: idiopathic.

Online Etymology Dictionary, © 2010 Douglas Harper
idiopathy in Medicine

idiopathy

[ĭd′ē-ŏp′ə-thē]
n.
  1. A disease of unknown origin or cause.
  2. A primary disease arising spontaneously with no apparent external cause.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.