- 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" (see organ).
- erg (n.2)
- "region of drifting sand dunes," 1875, from French erg (1854), from North African Arabic 'irj, from a Berber word.
