The origin of the word 'sprocket' is obscure, first appearing in English in the 16th century. It is likely a dialectal or regional coinage, possibly imitative in nature, related to the mechanical action or sound of a toothed wheel engaging with a chain. There is no clear evidence linking it to classical roots like Latin or Greek. The term became standardized in mechanical engineering to specifically denote the toothed wheel that drives a chain, as seen in bicycles and machinery, solidifying its modern technical meaning.

The word 'sprocket' is a simplex word of uncertain origin. It does not contain separable, meaningful morphemes in modern English.