idiopathic
adjective/ˌɪdiəˈpæθɪk/
/ˌɪdiəˈpæθɪk/
(medical)- (of an illness) having no obvious cause
- The most common type of epilepsy is idiopathic epilepsy, which has no identifiable cause.
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idiopathic
Definition of idiopathic adjective from the Oxford Advanced Learner's Dictionary