Definition of microphone noun from the Oxford Advanced American Dictionary

 

microphone

 noun
noun
NAmE//ˈmaɪkrəˌfoʊn//
 
(informal mic, mike)
 
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a device that is used for recording sounds or for making your voice louder when you are speaking or singing to an audience to speak into the microphone Their remarks were picked up by the hidden microphones.
See the Oxford Advanced Learner's Dictionary entry: microphone