Sprocket
/sprˈɑkət/
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Definition
(noun) A toothed wheel that enmeshes with a chain or other perforated band.
Sentence Examples
Do you know what a sprocket is?
Prise off the circlip fastening the sprocket to the hub.
CEFR Practice Quiz
He had to replace a worn ____ on his bicycle chain to ensure the gear shifts remained smooth.