noun Electricity.
  1. a transformer having coils with a self-impedance that is essentially constant but a mutual impedance that can be varied by moving one coil with respect to the other.

Origin of variocoupler

First recorded in 1920–25; vari(able) + -o- + coupler Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of variocoupler