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Definition of moving-coil
1 : operated by the force exerted upon a movable electric-current-carrying coil suspended in a magnetic field
a moving-coil galvanometer
2 : operating by means of an electric-current-carrying coil or a single conductor that moves in a magnetic field (as in a dynamic loudspeaker or a dynamic pickup)
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Merriam-Webster unabridgedWords at Play
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