/ Dictionary / Index P postboy: Meaning and Definition of Find definitions for: post•boy Pronunciation: (pōst'boi"), [key] — n. (formerly) a boy or man who rode post or carried mail. a postilion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. postbox postcanonical Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language