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bug (informal) a tiny microphone hidden for the purpose of listening to and recording voices secretly. [1/6 definitions]
diaphragm a thin disk in electronic tools such as microphones, speakers, and telephones. In a microphone, the diaphragm changes sound vibrations into electrical signals. In a speaker, it changes electrical signals into sound vibrations. [1/2 definitions]
microphone A microphone is something that people speak into when they want to make their voice louder for other people to hear. People also use a microphone when they want to make a recording of their voice or other sounds.