/ Dictionary / Index C center pin: Meaning and Definition of Find definitions for: cen'ter pin" Pronunciation: [key] — Railroads. Railroads. a cylindrical device passing through the center plates of both the body bolster and the truck bolster, permitting the truck to swivel beneath the car body while the stress is taken by the center plate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. centerpiece center-pivot irrigation Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language