/ Dictionary / Index B bystander: Meaning and Definition of Find definitions for: by•stand•er Pronunciation: (bī'stan"dur), [key] — n. a person present but not involved; chance spectator; onlooker. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bystander (Thesaurus) byssus by-street Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language