GNU Collaborative International Dictionary of English

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1.       
   Erg (?), n. [Gr.  work.] (Physics) The unit of work or energy in the C. G. S. system, being the amount of work done by a dyne working through a distance of one centimeter; the amount of energy expended in moving a body one centimeter against a force of one dyne (981 dynes exert the same force as a one gram mass in the earth's gravitational field). One foot pound is equal to 13,560,000 ergs.  The absolute Joule is equivalent to 107 ergs, which are equivalent to 0.2389 gram-calories at 15° C.  See also mechanical equivalent of heat under equivalent.
   
   [1913 Webster +PJC]