/ Dictionary / Index P postrider: Meaning and Definition of Find definitions for: post•rid•er Pronunciation: (pōst'rī"dur), [key] — n. (formerly) a person who rode post; a mounted mail carrier. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. postremogeniture post road Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language