idiopathic

[ id-ee-uh-path-ik ]

/ ˌɪd i əˈpæθ ɪk /

of unknown cause, as a disease.

RELATED WORDS

First recorded in 1660–70; idio- + -pathic

Related formsid·i·o·path·i·cal·ly, adverb

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

We may mention the convulsive seizures of idiopathic epilepsy only to dismiss them.
Tics and Their Treatment|Henry Meigne
A removal of the cause in idiopathic rashes is all that is needed, the erythema sooner or later subsiding.
Essentials of Diseases of the Skin|Henry Weightman Stelwagon
An atrophic, brittle, dry condition of the hair, and which may be either symptomatic or idiopathic.
Essentials of Diseases of the Skin|Henry Weightman Stelwagon
The remote causes of ascites may be either symptomatic or idiopathic, and either local or general.
North American Medical and Surgical Journal, Vol. 2, No. 3, July, 1826|Various

This idiopathic cataract mostly occurs in old people; hence the term senile cataract.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1|Various

[ ĭd′ē-ə-păth′ĭk ]

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

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

[ ĭd′ē-ə-păth′ĭk ]

Relating to or being a disease having no known cause.