1 definition found From The Collaborative International Dictionary of English v.0.44 [gcide]: Autotransformer \Au'to*trans*form"er\, noun [Auto- + transformer.] (Elec.) A transformer in which part of the primary winding is used as a secondary winding, or vice versa; -- called also a {compensator} or {balancing coil}. [Webster 1913 Suppl.]

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