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Definition of: microphone
Our photo definition of microphone 
(mī′krə·fōn) noun
A device for amplifying sounds by the electromagnetic conversion of sound waves impinging upon a sensitive diaphragm. It forms the principal element of a telephone transmitter, and is the first component of any sound–reproducing system, as in radio broadcasting, sound films, etc.
—mi′cro·phon′ic (-fon′ik) adjective
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