sprock ‧ et /ˈsprɒkət, ˈsprɒkɪt $ ˈsprɑː-/ BrE AmE noun [countable]
1 . ( also sprocket wheel ) a wheel with ↑ teeth (=parts along the edge) that fit into and turn a bicycle chain, a photographic film with holes etc
2 . one of the teeth on a sprocket wheel