protosalt
/ˈprəʊtə(ʊ)sɔːlt/ /ˈprəʊtə(ʊ)sɒlt/Chemistry. Now rare
noun
A salt in which the anion occurs in the smallest possible proportion relative to the metal cation (i.e. in which the metal occurs in its lowest oxidation state).
Origin
Early 19th century; earliest use found in Michael Faraday (1791–1867), natural philosopher, scientific adviser, and Sandemanian. From proto- + salt.
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