autotransformer

[aw-toh-trans-fawr-mer]

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noun Electricity.

a transformer having a single coil that serves as both a primary coil and a secondary coil.

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Origin:
1890–95; auto-¹ + transformer

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To autotransformer

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Autotransformer has a plethora of syllables.

So is cyclotrimethylenetrinitramine. Does it mean:

an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.

a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.

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Collins

World English Dictionary

autotransformer (ˌɔːtəʊtrænsˈfɔːmə)

—n
	a transformer in which part of the winding is common to both primary and secondary circuits

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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autotransformer

au·to·trans·form·er