- Thiosulphate Thi`o*sul"phate, n. (Chem.)
A salt of thiosulphuric acid; -- formerly called
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. [1913 Webster]
The Collaborative International Dictionary of English. 2000.