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watt-hour

[wot-ouuh r, -ou-er] /ˈwɒtˌaʊər, -ˌaʊ ər/
noun
1.
a unit of energy equal to the energy of one watt operating for one hour, equivalent to 3600 joules.
Abbreviation: Wh.
Also, watthour.
Origin
1885-1890
1885-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for watt hour

watt-hour

noun
1.
a unit of energy equal to a power of one watt operating for one hour. 1 watt-hour equals 3600 joules
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
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watt hour in Science
watt-hour  
A unit of energy, especially electrical energy, equal to the work done by one watt acting for one hour. It is equivalent to 3,600 joules.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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