Dictionary![]() ![]() rack-and-pin•ionPronunciation: (rak'un-pin'yun), [key] —adj. of or pertaining to a mechanism in which a rack engages a pinion: rack-and-pinion steering. See illus. under rack 1. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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