D defs.my
Entry 1 sense Webster, 1913

Autotransformer

· Au·to·trans·form·er · IPA
01 n. 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.
  1. 1.
    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.(Elec.) Also: compensator, balancing coil