Earphone
/ˈɪˌrfoʊn/
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Definition
(noun) A transducer that converts electric signals into sound and is held near the ear, especially as part of a telephone; an earpiece or headphone.
Sentence Examples
He was listening to the radio with his earphone.
I can barely hear without my earphone.
CEFR Practice Quiz
He was listening to the radio with his ____.