D defs.my
Entry 2 senses Webster, 1913

Gearing

· Gear·ing · IPA /ɡˈɪrɪŋ/
01 n. Harness.
  1. 1.
    Harness.
  2. 2.
    The parts by which motion imparted to one portion of an engine or machine is transmitted to another, considered collectively; as, the valve gearing of a locomotive engine; belt gearing; esp., a train of wheels for transmitting and varying motion in machinery.(Mach.)
Phrases & compounds
Frictional gearing — See under Frictional.
Gearing chain — an endless chain transmitting motion from one sprocket wheel to another. See Illust. of Chain wheel.
Spur gearing — gearing in which the teeth or cogs are ranged round either the concave or the convex surface (properly the latter) of a cylindrical wheel; -- for transmitting motion between parallel shafts, etc.