[] () a bank that deals with large businesses, for example providing finance for trade with foreign companies, helping with the sales of shares or bonds, or giving advice on investments商业银行；投资银行◆They appointed merchant bank Lazard to advise them on the takeover.他们指定拉扎德投资银行就这宗收购提供建议。➡investment bank ▸ˌmerchant ˈbanker