/ Dictionary / Index P passerby: Meaning and Definition of Find definitions for: pass•er•by Pronunciation: (pas'ur-bī', -bī", pä'sur-), [key] — pl. pass•ers•by a person passing by. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: passerby (Thesaurus) passer passeriform 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