Someone who bids (all senses), but most commonly, one offers to pay a specified price at an auction / One who commands or orders / (rare or dated) One who asks or invites

plural of bidder

(US) One who bids at an auction on behalf of the auctioneer or owner, for the purpose of driving up the price.

plural of by-bidder

A surname.

A kind of metallic ware made in India, composed zinc, tin, and lead, in which ornaments of gold and silver are inlaid or damascened.