Words / 1907 Nuttall Encyclopædia of General Knowledge / H / Horse-power
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Horse-power, the unit of work of a steam-engine, being the power to raise 33,000 lbs. one foot in one minute.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Horse-power in Brewer’s Dictionary of Phrase & Fable