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variocoupler

noun
var·​io·​coupler | \ ¦verē(ˌ)ō, ¦va(a)rē(ˌ)ō+\

Definition of variocoupler

: an inductive coupler the mutual inductance of which is adjustable by moving one coil with respect to the other

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History and Etymology for variocoupler

vari- + coupler

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