a white, crystalline, water-soluble powder, Na2S2O3⋅5H2O, used as a bleach and in photography as a fixing agent.
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Origin of sodium thiosulfate
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Medicine definitions for sodium thiosulfate
A translucent crystalline compound used in conjunction with sodium nitrite as an antidote in cyanide poisoning, as a fungicide in swimming pools and baths, and as a means to measure the extracellular fluid volume of the body.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.