noun
seltzer
SELT-ser/ˈseltsər/
Water containing dissolved gas that makes it fizzy.
Fine bubbles rise through the colorless seltzer beside the soda siphon.

Etymology
The pieces mean 'of Selters,' naming the village where the mineral water was found. A name identifying that water's origin became a general term for carbonated water.
In context
I also have 2/3 of a cup of seltzer water
More examples
- Would you like plain or lime-flavored seltzer?
- The seltzer loses its fizz if you leave the bottle open.
- We ordered two seltzers with lunch.
Forms
seltzer · seltzers
Similar words
- sparkling water
- Also includes mineral water with naturally occurring carbonation.
- club soda
- Typically contains added mineral salts, unlike plain seltzer.