calcium bisulfite
noun
Definition of calcium bisulfite
: acid calcium sulfite Ca(HSO3)2 obtained as a yellowish solution usually containing free sulfur dioxide by reaction of sulfur dioxide with limestone in the presence of water or with calcium hydroxide and used in the sulfite process for making wood pulp and as a disinfectant and antichlor —called also bisulfite of lime, calcium hydrogen sulfite
From the M-W Editors
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