erg
UK[ɜːɡ]US[ɜːrɡ]
n
A unit of work or energy in the centimetre-gram-second system of units, 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
The term 'erg' entered the scientific lexicon in the late 19th century, directly adopted from the Greek 'érgon', which signifies "work" or "deed". This Greek term itself descends from the Proto-Indo-European root werg-, meaning "to do" or "to work", a root also ancestral to the English word 'work'. The logic of its adoption is elegantly direct: a fundamental unit of energy or work is named for the ancient concept of work itself. Thus, the modern, highly technical definition is a precise quantification of the ancient, abstract idea.
Analysis
The word 'erg' is a simplex loanword. It is borrowed directly from the Greek noun 'ἔργον' (érgon), meaning "work". In English, it functions as a single, unanalyzable morpheme denoting a specific scientific unit.
Examples
In the CGS system, the erg is the standard unit of energy.
The amount of energy required was measured in ergs.
One erg is a very small unit of energy compared to a joule.