Search Result for "rack and pinion":
Wordnet 3.0

NOUN (1)

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



WordNet (r) 3.0 (2006):

rack and pinion
    n 1: a wheel gear (the pinion) meshes with a toothed rack;
         converts rotary to reciprocating motion (and vice versa)