Dictionary![]() ![]() so'dium thiosul'fateChem. a white, crystalline, water-soluble powder, Na2S2O3·5H2O, used as a bleach and in photography as a fixing agent. Also called hypo, hyposulfite, sodium hyposulfite. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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