病びょう因いん

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

cause of a disease; etiology

Medical term for the origin or cause of an illness. Often used in formal or clinical settings.

• この病びょう気きの病びょう因いんはまだ解かい明めいされていない。

  The cause of this disease has not yet been clarified.

• 病びょう因いんを特とく定ていするために、詳くわしい検けん査さが必ひつ要ようだ。

  Detailed tests are needed to identify the cause of the disease.