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wattmeter

[wot-mee-ter]
noun Electricity.
  1. a calibrated instrument for measuring electric power in watts.
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Origin of wattmeter

First recorded in 1885–90; watt + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for wattmeter

wattmeter

noun
  1. a meter for measuring electric power in watts
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012