1 (Also called)
sprocket wheel a relatively thin wheel having teeth projecting radially from the rim, esp. one that drives or is driven by a chain
2 an individual tooth on such a wheel
3 a cylindrical wheel with teeth on one or both rims for pulling film through a camera or projector
4 a small wedge-shaped piece of wood used to extend a roof over the eaves
(C16: of unknown origin)
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