(US) the glass in which drinks are served in a soda fountain / glass manufactured using soda ash

Used attributively to describe a fire extinguisher that generates a stream of water powered by carbon dioxide generated by reacting sulfuric acid with sodium bicarbonate

(obsolete) Of, relating to, or containing soda.

sodium carbonate used as a laundry aid

Soda water flavoured with vanilla etc.

(Canada, US) carbonated water

(US, idiomatic, dated) A person who works at a soda fountain.

industrial-grade sodium carbonate

(chemistry) The sodium salt of acetic acid.

(obsolete) Sodium dithionite.