supersalt
/ˈsuːpəsɔːlt/ /ˈsuːpəsɒlt/ /ˈsjuːpəsɔːlt/Chemistry. Now rare
noun
A salt containing an excess of the acid over the base; an acid salt.
Origin
Early 19th century; earliest use found in Thomas Thomson (1773–1852), chemist. From super- + salt. Slightly earlier currency is probably implied by super.