/ Dictionary / Index W watt-hour: Meaning and Definition of Find definitions for: watt-hour Pronunciation: (wot'our", -ou"ur), [key] — n. a unit of energy equal to the energy of one watt operating for one hour, equivalent to 3600 joules. Abbr.: Wh Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: watt-hour (Thesaurus) Watterson wattle Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language