pinion : Idioms & Phrases

• the pinion on the minute hand arbor of a watch or clock, which drives the hand but permits it to be moved in setting.

Webster 1913

• the fly of a clock.

Webster 1913

• noun a small pinion having cylindrical bars instead of teeth, used chiefly in inexpensive clocks
  lantern wheel.
  

WordNet

• . See under Lantern.

Webster 1913

• (Mach.), a kind of pinion or wheel having cylindrical bars or trundles, instead of teeth, inserted at their ends in two parallel disks or plates; so called as resembling a lantern in shape; called also wallower, or trundle.

Webster 1913

• noun gears that mesh at an angle
  bevel gear; pinion and crown wheel.
  

WordNet

• noun gears that mesh at an angle
  bevel gear; pinion and crown wheel.
  

WordNet

• wire fluted longitudinally, for making the pinions of clocks and watches. It is formed by being drawn through holes of the shape required for the leaves or teeth of the pinions.

Webster 1913

• noun a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
  

WordNet