au·​to·​trans·​form·​er ˌȯ-tō-tran(t)s-ˈfȯr-mər How to pronounce autotransformer (audio)
: a transformer in which the primary and secondary coils have part or all of their turns in common

Examples of autotransformer in a Sentence

Recent Examples on the Web Already, Ireland and Latvia have contributed one spare autotransformer each. Thomas Popik, Foreign Affairs, 3 Feb. 2023 The United States has minimal capacity to build autotransformers. Thomas Popik, Foreign Affairs, 3 Feb. 2023 At the heart of every power substation are hulking, high-power autotransformers. Marc Santora, New York Times, 11 Apr. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'autotransformer.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


auto- + transformer

First Known Use

1895, in the meaning defined above

Time Traveler
The first known use of autotransformer was in 1895

Dictionary Entries Near autotransformer

Cite this Entry

“Autotransformer.” Dictionary, Merriam-Webster, Accessed 21 Sep. 2023.

Last Updated: - Updated example sentences
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