horse power

horsepower

[hawrs-pou-er]
noun
1.
a foot-pound-second unit of power, equivalent to 550 foot-pounds per second, or 745.7 watts.
2.
Informal. the capacity to achieve or produce; strength or talent: The university's history faculty is noted for its intellectual horsepower.

Origin:
1800–10; horse + power

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World English Dictionary
horsepower (ˈhɔːsˌpaʊə)
 
n
1.  an fps unit of power, equal to 550 foot-pounds per second (equivalent to 745.7 watts)
2.  a US standard unit of power, equal to 746 watts

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

horsepower
1806, from horse + power, established by Watt as the power needed to lift 33,000 pounds one foot in one minute, which is actually about 1.5 times the power of a strong horse.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
horsepower   (hôrs'pou'ər)  Pronunciation Key 
A unit that is used to measure the power of engines and motors. One unit of horsepower is equal to the power needed to lift 550 pounds one foot in one second. This unit has been widely replaced by the watt in scientific usage; one horsepower is equal to 745.7 watts.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

horsepower definition


A unit of power equal to about 746 watts.

Note: The horsepower is used to measure the power of engines.
Note: This term was coined by James Watt, who invented a new type of steam engine in the eighteenth century. Watt found that the horse could do a certain amount of work per second; when he sold his steam engines, this measurement allowed him to estimate the worth of an engine in terms of the number of horses it would replace. Therefore, a six-horsepower engine was capable of replacing six horses.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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