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variocoupler

[vair-ee-oh-kuhp-ler] /ˌvɛər i oʊˈkʌp lər/
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
1920-1925
1920-25; vari(able) + -o- + coupler
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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