erg > define
noun
- A cgs unit of work or energy; the work done by a force of one dyne acting over a distance of one centimeter. .
by WordNet 3.0 © 2006 by Princeton University
(n.) 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. One foot pound is equal to 13,560,000 ergs.
by Webster's Revised Unabridged Dictionary