cog

noun cog

• prong — one of the pointed tines of a fork.
• wheel — a circular frame or disk arranged to revolve on an axis, as on or in vehicles or machinery.
• gear — Machinery. a part, as a disk, wheel, or section of a shaft, having cut teeth of such form, size, and spacing that they mesh with teeth in another part to transmit or receive force and motion. an assembly of such parts. one of several possible arrangements of such parts in a mechanism, as an automobile transmission, for affording different relations of torque and speed between the driving and the driven machinery, or for permitting the driven machinery to run in either direction: first gear; reverse gear. a mechanism or group of parts performing one function or serving one purpose in a complex machine: steering gear.
• transmission — the act or process of transmitting.
• tooth — (in most vertebrates) one of the hard bodies or processes usually attached in a row to each jaw, serving for the prehension and mastication of food, as weapons of attack or defense, etc., and in mammals typically composed chiefly of dentin surrounding a sensitive pulp and covered on the crown with enamel.