wattmeter

[ wot-mee-ter ]
/ ˈwɒtˌmi tər /

noun Electricity.

a calibrated instrument for measuring electric power in watts.

Origin of wattmeter

First recorded in 1885–90; watt + -meter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for wattmeter

wattmeter

/ (ˈwɒtˌmiːtə) /

noun

a meter for measuring electric power in watts
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