特とく発はつ

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

idiopathy; idiopathic

Medical term for a disease or condition of unknown cause. Often 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特とく定ていできない。

  Idiopathic diseases have no identifiable 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.

noun, noun or participle which takes 'suru'

special train; special bus; extra service

Refers to a train, bus, or other transport service arranged for a specific purpose, not part of the regular schedule. Can be used as a suru-verb.

• イベントのために特とく発はつ列れっ車しゃが運うん行こうされた。

  A special train was operated for the event.

• 観かん光こうシーズンにはバスを特とく発はつする。

  During the tourist season, they run extra buses.