/ Dictionary / Index B by-bidder: Meaning and Definition of Find definitions for: by-bid•der Pronunciation: (bī'bid"ur), [key] — n. a person employed to bid at an auction in order to raise the prices for the auctioneer or seller. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Byatt Byblos Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language