特とく発はつ性せい

noun which may take the genitive case particle 'no', noun

idiopathic; spontaneous

Medical term describing a disease or condition that arises without a known cause. Used attributively with の.

• 特とく発はつ性せいの疾しっ患かんは原げん因いんがはっきりしないことが多おおい。

  Idiopathic diseases often have no clear cause.

• この症しょう状じょうは特とく発はつ性せいと考かんがえられている。

  This symptom is considered idiopathic.