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Wiktionary

disulfite

n. 1 (context inorganic chemistry English) The divalent anion S₂O₅^2-, or any salt containing this anion 2 (context inorganic chemistry English) bisulfite

Wikipedia

Disulfite

A disulfite, commonly known as metabisulfite or pyrosulfite, is a chemical compound containing the disulfite ion (metabisulfite ion) .