What word or phrase does your mother always say?
unit of energy in the C.G.S. system, coined 1873 by the British Association for the Advancement of Science from Greek ergon "work" (see urge (v.)).
"region of drifting sand dunes," 1875, from French erg (1854), from North African Arabic 'irj, from a Berber word.
The centimeter-gram-second unit of energy or work equal to the work done by a force of one dyne acting over a distance of one centimeter.
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The unit of energy or work in the centimeter-gram-second system, equal to the force of one dyne over a distance of one centimeter. This unit has been mostly replaced by the joule.