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sprocket (n.)

1530s, originally a carpenters' word for a piece of timber used in framing, of unknown origin. The meaning "projection from the rim of a wheel that engages the links of a chain" is first recorded 1750.

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Definitions of sprocket from WordNet

sprocket (n.)
roller that has teeth on the rims to pull film or paper through;
sprocket (n.)
thin wheel with teeth that engage with a chain;
Synonyms: sprocket wheel
sprocket (n.)
tooth on the rim of gear wheel;
Synonyms: cog
From wordnet.princeton.edu