[selt-ser] 
| 1. | (sometimes initial capital letter ) a naturally effervescent mineral water containing common salt and small quantities of sodium, calcium, and magnesium carbonates. |
| 2. | tap water that has been commercially filtered, carbonated, and bottled with no addition of minerals or mineral salts. |
| car·bon·at·ed water (kär'bə-nā'tĭd) n. Effervescent water, usually containing salts, charged under pressure with purified carbon dioxide gas, used as a beverage or mixer. Also called club soda, seltzer, soda, soda water. |
| selt·zer (sělt'sər) n.
[From German Selterser (Wasser), (water) of Selters, a village of central Germany.] |