Etymology
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idiopathy (n.)

"primary disease," 1690s, Modern Latin, from medical Greek idiopatheia, from idios "one's own" (see idiom) + -patheia, abstract noun formation from pathos "suffering, disease, feeling" (from PIE root *kwent(h)- "to suffer"). Related: idiopathic.

updated on May 18, 2017

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Definitions of idiopathy from WordNet

idiopathy (n.)
any disease arising from internal dysfunctions of unknown cause;
Synonyms: idiopathic disease / idiopathic disorder
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.