There are 2 main definitions of erg in English:

erg1

Line breaks: erg
Pronunciation: /əːɡ
 
/

noun

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.
More example sentences
  • Luckily, there are plenty of units for energy, so it is probably best to just leave the calorie unit to the food people, and use joules or Kilowatt hours or therms or ergs for energy calculations unrelated to human nutrition.
  • There are no ergs, joules, electron-volts, calories, or foot-pounds of New Age energy.
  • An energy unit - be it an erg, joule, BTU, or other - describes a definitive amount of energy.

Origin

late 19th century: from Greek ergon 'work'.

Definition of erg in:

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There are 2 main definitions of erg in English:

erg2

Line breaks: erg
Pronunciation: /əːɡ
 
/

noun (plural ergs or areg /ˈɑːrɛɡ/)

An area of shifting sand dunes in the Sahara.
More example sentences
  • Those who were ahead of us entered an erg of dunes and Gio and I took a better path.
  • The sand seas or ergs cover thousands of square kilometres, and in places the sand cover may be hundreds of metres thick.
  • For photographers, the atmosphere of the pinnacles changes dramatically as the light varies and these ergs provide a great opportunity to capture those shafts of sunlight which are so spectacular early and late in the day.

Origin

late 19th century: from French, from Arabic ‘irk, ‘erg.

Definition of erg in: