Dictionary
horse•pow•er-hour
Pronunciation: (hôrs'pou"ur-ouur", -ou"ur), [key]—
n.
a foot-pound-second unit of energy or work, equal to the work done by a mechanism with a power output of one horsepower over a period of one hour.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.