sodium bisulfite
noun
variants
or less commonly sodium acid sulfite
: either of two salts usually obtained by passing sulfur dioxide through a solution of sodium carbonate:
a
: an unstable crystalline salt NaHSO3 that is known especially in solution and forms sodium metabisulfite on dehydration; sodium hydrogen sulfite
b
: sodium metabisulfite
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Merriam-Webster unabridged
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