protosulphate
/ˌprəʊtə(ʊ)ˈsʌlfeɪt/(also protosulfate) Chemistry. Now rare
noun
A sulphate in which the sulphate anion occurs in its smallest possible proportion relative to the other element (i.e. one in which the other element occurs in its lowest oxidation state).
Origin
Early 19th century. From proto- + sulphate.
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