[wot-ouuhr, -ou-er]
a unit of energy equal to the energy of one watt operating for one hour, equivalent to 3600 joules. Abbreviation: Wh
Also, watthour.


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World English Dictionary
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 10th Edition
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American Heritage
Science Dictionary
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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Example sentences
Per watt-hour, the materials cost the same as other lithium-iron-phosphate electrode materials, he says.
Every utility shall install such watt-hour meters as necessary to obtain a record of output of its generating station or stations.
The watt-hour constant for the meter itself shall be shown on all watt-hour meters.
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