autotransformer

noun
au·to·trans·form·er | \ˌȯ-tō-tran(t)s-ˈfȯr-mər \

Definition of autotransformer 

: a transformer in which the primary and secondary coils have part or all of their turns in common

First Known Use of autotransformer

1895, in the meaning defined above

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The first known use of autotransformer was in 1895

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