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Webster's 1913 Dictionary

THIOSULPHATE

THIOSULPHATE Thi `o *sul "phate, n. (Chem. )

Defn: A salt of thiosulphuric acid; -- formerly called hyposulphite.

Note: 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.

Oxford Dictionary

thiosulphate

thiosulphate |ˌθʌɪə (ʊ )ˈsʌlfeɪt |(US thiosulfate ) ▶noun Chemistry a salt containing the anion S 2 O 3 2 −, i.e. a sulphate with one oxygen atom replaced by sulphur.

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