wattmeter

noun
watt·​me·​ter | \ˈwät-ˌmē-tər \

Definition of wattmeter 

: an instrument for measuring electric power in watts

First Known Use of wattmeter

1887, in the meaning defined above

History and Etymology for wattmeter

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The first known use of wattmeter was in 1887

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wattmeter

noun
watt·​me·​ter | \ˈwät-ˌmēt-ər \

Medical Definition of wattmeter 

: an instrument for measuring electric power in watts

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