noun
clinical trial participant; clinical trial subject
Refers to a person who participates in a clinical trial, typically in a medical or pharmaceutical context.
新しい薬の治験者を募集しています。
We are recruiting participants for a clinical trial of a new drug.
治験者は同意書にサインする必要があります。
Clinical trial subjects must sign a consent form.
Compound of 治 (chi, 'treatment') + 験 (ken, 'test') + 者 (sha, 'person'). The term is a modern coinage reflecting the concept of a person undergoing a medical trial.