/ Dictionary / Index R rack and pinion: Meaning and Definition of Find definitions for: rack' and pin'ion Pronunciation: [key] — Mach., Auto. Mach.,Auto. See under (def. 5a). rack-and-pin•ion Pronunciation: (rak'un-pin'yun), [key] — adj. of or pertaining to a mechanism in which a rack engages a pinion:See illus. under. rack-and-pinion steering. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rack rackboard Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language