A projection on a machine part that engages with the teeth of a wheel to interconvert reciprocating and rotary motions; spec. (in a clock or watch)…

Mechanics. In extended use: a notched, cogged, or toothed bar for engaging a cogwheel, pinion, or worm so as to convert rotary into linear motion, or…

(a) the motion of bodies which are moving in parallel directions, of one body in a direction parallel to another, or of a body which points in the…

Mechanics. a mechanism comprising a rack coupled to a pinion (pinion, n.4); frequently attributive.

= rack, n.4 5b.

a pivoting rod or arm; spec. (a) a rod pivoted at one end so that the other end can move in a circle or an arc of a circle, used esp. as one of a…

= rack bar, n.1