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[jool, joul] /dʒul, dʒaʊl/
noun, Physics.
the standard unit of work or energy in the International System of Units (SI), equal to the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force: equivalent to 10 7 ergs and one watt-second.
Abbreviation: J, j.
Also called newton-meter.
Origin of joule
1885-90; named after J. P. Joule Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for joules


the derived SI unit of work or energy; the work done when the point of application of a force of 1 newton is displaced through a distance of 1 metre in the direction of the force. 1 joule is equivalent to 1 watt-second, 107 ergs, 0.2390 calories, or 0.738 foot-pound J
Word Origin
C19: named after James Prescott Joule


James Prescott. 1818–89, English physicist, who evaluated the mechanical equivalent of heat and contributed to the study of heat and electricity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for joules



unit of electrical energy, 1882, coined in recognition of British physicist James P. Joule (1818-1889).

Online Etymology Dictionary, © 2010 Douglas Harper
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joules in Medicine

joule (jōōl, joul)
Abbr. J

  1. The International System unit of electrical, mechanical, and thermal energy.

  2. A unit of electrical energy equal to the work done when a current of 1 ampere is passed through a resistance of 1 ohm for 1 second.

  3. A unit of energy equal to the work done when a force of 1 newton acts through a distance of 1 meter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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joules in Science
  (jl, joul)   
The SI derived unit used to measure energy or work. One joule is equal to the energy used to accelerate a body with a mass of one kilogram using one newton of force over a distance of one meter. One joule is also equivalent to one watt-second.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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