"containing carbon dioxide," 1858, past-participle adjective from carbonate (v.).
Entries linking to carbonated
carbonate v.
1805, "form into a carbonate," from carbonate (n.) by influence of French carbonater "transform into a carbonate." The meaning "impregnate with carbonic acid gas (i.e. carbon dioxide)" is from 1850s. Related: Carbonated; carbonating.