Dictionary
so'dium thiosul'fate
Chem.
a white, crystalline, water-soluble powder, Na
2S
2O
3·5H
2O, 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.