noun, Chemistry.
a white, crystalline, water-soluble powder, Na 2 S 2 O 3 ⋅5H 2 O, used as a bleach and in photography as a fixing agent.

sodium thiosulfate n.
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.

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