erg Definition

erg¹
noun

1. 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.

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erg²
noun

areg, ergs
1. An area of shifting sand dunes, especially in the Sahara Desert.

Etymology: 19c: French, from Arabic 'irj.