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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.

Search results for 'erg':

erg1 noun, physics in the cgs system: a unit of work or energy defined as the amount of work done when a force of one dyne moves through a distance of one centimetre.
ETYMOLOGY: 19c: from Greek ergon work.

erg2 noun (areg or ergs) an area of shifting sand dunes, especially in the Sahara Desert.
ETYMOLOGY: 19c: French, from Arabic 'irj.