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.
特発性の疾患は原因がはっきりしないことが多い。
Idiopathic diseases often have no clear cause.
この症状は特発性と考えられている。
This symptom is considered idiopathic.