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