idiopathic

1. 1.

   Of, relating to, or designating a disease or condition having no known cause.

   病因不明的,特发性的

2. 2.

   (of diseases) arising from an unknown cause

   (疾病)原因不明的

(疾病)原因不明的；自发的；原发的；特发的；[医] 自发的；特发的

In use