erg (n.1)youdaoicibaDictYouDict[erg 词源字典]
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 etymology, erg origin, 英语词源]
erg (n.2)youdaoicibaDictYouDict
"region of drifting sand dunes," 1875, from French erg (1854), from North African Arabic 'irj, from a Berber word.