SINCE 1828
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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Merriam-Webster unabridged
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