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Webster 1913 Edition
Thiosulphate
Thiˊo-sul′phate
,Noun.
(Chem.)
A salt of thiosulphuric acid; – formerly called
hyposulphite
. ☞ The sodium salt called in photography by the name sodium hyposulphite, being used as a solvent for the excess of unchanged silver chloride, bromide, and iodide on the sensitive plate.