San Salvador /sæn ˈsælvədɔɹ/ noun5 •The capital city of El Salvador. •A department of El Salvador. •Ellipsis of San Salvador Island: an island of the Bahamas. •(historical) Ellipsis of San Salvador Island: the first island discovered on Christopher Columbus's first voyage. •(historical) Ellipsis of San Salvador Island, former name of Santiago: an island of Galapagos, Ecuador.