noun
a medical instrument used for listening to sounds within the body, typically consisting of a disc-shaped resonator and two tubes connected to earpieces
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The doctor used a phonendoscope to listen to the patient's heartbeat.
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The nurse grabbed the phonendoscope to check my lungs.
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I borrowed my friend's phonendoscope to eavesdrop on the neighbors.
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The musician used the phonendoscope to listen closely to the subtle nuances in the music.