Definition of protosulphate in English:

protosulphate

(also protosulfate)

noun

Chemistry
rare
  • 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.

Pronunciation

protosulphate

/ˌprəʊtə(ʊ)ˈsʌlfeɪt/