病びょう原げん

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

cause of a disease; pathogen; etiology

Refers to the origin or cause of an illness, including pathogens, genetic factors, or environmental triggers. Used in medical and general contexts.

• この病びょう気きの病びょう原げんはまだ特とく定ていされていない。

  The cause of this disease has not yet been identified.

• 病びょう原げん菌きんが体たい内ないに侵しん入にゅうすると感かん染せん症しょうを引ひき起おこす。

  When pathogenic bacteria enter the body, they cause infectious diseases.