Electronics a piezoelectric transducer consisting of two crystals cemented together, used in microphones, headphones, loudspeakers, etc. to convert vibrations into a voltage output or to convert a signal voltage into vibrations that can produce audible sounds
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often called bimorph noun or ˈbiˌmorphous cell (ˈbaɪˌmɔrfəs; baɪˈmɔrfəs)