soda water
     n 1: effervescent beverage artificially charged with carbon
          dioxide [syn: {carbonated water}, {club soda}, {seltzer},
           {sparkling water}]
     2: a sweet drink containing carbonated water and flavoring; "in
        New England they call sodas tonics" [syn: {pop}, {soda}, {soda
        pop}, {tonic}]
Source: WordNet® 2.0