metabisulfite

noun
meta·​bi·​sul·​fite
variants: or chiefly British metabisulphite \ -​ˌbī-​ˈsəl-​ˌfīt \

Medical Definition of metabisulfite 

: a salt containing the bivalent anion S2O52− obtained by heating a bisulfite — see sodium metabisulfite

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