microphone UK /ˈmaɪ.kɹəˌfəʊn/US /ˈmaɪ.kɹəˌfoʊn/noun 2verb 1forms 3 noun2 •A device (transducer) used to convert sound waves into a varying electric current; normally fed into an amplifier and either recorded or transmitted over radio.Behind the tangled garden of microphones that had sprouted on the lectern, Goldwater spoke softly and casually about his family. — 1965 •(no longer used) A speaking trumpet or hearing trumpet; an acoustic device to concentrate or amplify sound. verb1 •To put one or more microphones on or in. formsmicrophoned · microphoning · microphones