clinical trial
US /ˈklɪn.ɪ.kəl ˌtraɪəl/
UK /ˈklɪn.ɪ.kəl ˌtraɪəl/

1.
a research study conducted with human volunteers to evaluate the safety and effectiveness of new medical treatments, drugs, or devices
:
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The new drug is currently undergoing a clinical trial.
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Participation in the clinical trial is voluntary.