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WordReference Random House Unabridged Dictionary of American English © 2024rack′ and pin′ion, [Mach., Auto.]- Automotive, Mechanical EngineeringSee under rack 1 (def. 5a).
rack-and-pin•ion (rak′ən pin′yən),USA pronunciation adj. - Mechanical Engineeringof or pertaining to a mechanism in which a rack engages a pinion:rack-and-pinion steering.See illus. under rack 1.
Collins Concise English Dictionary © HarperCollins Publishers:: rack-and-pinion n - a device for converting rotary into linear motion and vice versa, in which a gearwheel (the pinion) engages with a flat toothed bar (the rack)
adj - (of a type of steering gear in motor vehicles) having a track rod with a rack along part of its length that engages with a pinion attached to the steering column
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