erg (n.1)

unit of energy in the C.G.S. system, coined 1873 by the British Association for the Advancement of Science, from Greek ergon "work," from PIE root *werg- "to do."

erg (n.2)

"region of drifting sand dunes," 1875, from French erg (1854), from North African Arabic 'irj, from a Berber word.

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Definitions of erg from WordNet

erg (n.)
a cgs unit of work or energy; the work done by a force of one dyne acting over a distance of one centimeter;