/ Dictionary / Index P piston rod: Meaning and Definition of Find definitions for: pis'ton rod" Pronunciation: [key] a rod communicating the rectilinear motion of a piston to the small end of a connecting rod or elsewhere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. piston ring pit Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language