鏈輪齒
Sprocket \Sprock"et\, n. [Etymology uncertain.] (Mach.) (a) A tooth or projection, as on the periphery of a wheel, shaped so as to engage with a chain. (b) A sprocket wheel.
sprocket n 1: roller that has teeth on the rims to pull film or paper through 2: thin wheel with teeth that engage with a chain [syn: {sprocket wheel}] 3: tooth on the rim of gear wheel [syn: {cog}]