/ Dictionary / Index W wrist pin: Meaning and Definition of Find definitions for: wrist' pin" Pronunciation: [key] — Mach. Mach. a pin joining the end of a connecting rod to a trunk piston or the end of a piston rod. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. wristlock wrist plate Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language