from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A device for the conversion of rotary and linear motion, consisting of a pinion and a mated rack.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A pair of
gears, consisting of a circular pinion that engages with the teethof a flat bar, that converts rotationalinto linearmotion; used in the steeringmechanism of cars, and in some railways
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)
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