聴診器
ちょうしんき · choushinki · JLPT N1 · noun
stethoscope
🩺 聴診器 = 聴 (listen) + 診 (examine) + 器 (device): a device for listening to examinations
聴 means hear or listen, 診 means medical examination, and 器 means instrument. Together they name the tool doctors use to listen to the chest and body.