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GEARING
1. Harness.
2. The parts by which motion imparted to one portion of an motor or car is transmitted to other, considered collectively; as, the valvegearing of locomotive motor; belt gearing; especially, a train of wheels for transmitting and varyingmotion in machinery. Frictional gearing. See Frictional. Gearing chain, an endlesschain transmitted motion from one sprocket wheel to other. Spur gearing, gearing in which the teeth or cogs are ranged roundeither the concave or the convex surface (properly the latter) of a cylindrical wheel; for transmitting motion between parallel shafts, etc.
Source: Websters Vocabulary