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The divalent anionic group, S2O3, derived from thiosulfuric acid, or a compound containing this group. Also called hyposulfite.
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(ˌθaɪ oʊˈsʌl feɪt)

a salt or ester of thiosulfuric acid.
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References in periodicals archive ?
Khalid, Study of the rates of reaction between [beta]-Monobromopropionate and thiosulphate ions in isodielectric media of aqueous n-propanol, J.
It was Mackiw, at the Ottawa plant, who made the most important discovery -- copper could be precipitated from the leach solution, prior to nickel removal, by controlling the leach to leave sufficient trithionate and thiosulphate ions in the liquor, so that copper sulphide would precipitate when the solution was boiled at atmospheric pressure.