Etymology
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seltzer

carbonated water, 1741, from German Selterser (Wasser), a kind of mineral water, literally "of Selters," village near Wiesbaden in Hesse-Nassau, where the mineral water is found.

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Definitions of seltzer

seltzer (n.)
naturally effervescent mineral water;
seltzer (n.)
effervescent beverage artificially charged with carbon dioxide;
Synonyms: soda water / carbonated water / club soda / sparkling water
From wordnet.princeton.edu