n. Physics a unit of work or energy, equal to the work done by a force of one dyne when its point of application moves one centimetre in the direction of action of the force.
Etymology: Gk ergon work
2.
n. (pl. ergs or areg) an area of shifting sand-dunes in the Sahara.
Etymology: F f. Arab. ' irj
Useful english dictionary. 2012.