Definitions

1. noun

carbonated water used for drinking or as an ingredient in recipes

“She poured a glass of seltzer to make a spritzer.”

2. noun

a type of sparkling water often used as a mixer for cocktails

“The bartender added a splash of seltzer to the whiskey sour.”

3. proper noun

Seltzer, a surname, or the town of Seltzer, Pennsylvania

“The family lived in Seltzer, Pennsylvania, for many years.”

4. verb

to add carbonated water to a drink, often used in bartending

“The bartender seltzered the cocktail with a splash of soda water.”