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Definition of Sodium thiosulfate
1. Noun. A compound used as a fixing agent in photographic developing.
Medical Definition of Sodium thiosulfate
1. Na2S2O3-5H2O;an antidote in cyanide poisoning in conjunction with sodium nitrite; used as a prophylactic agent against ringworm infections in swimming pools and baths, and to measure the extracellular fluid volume of the body. Synonym: sodium hyposulfite. (05 Mar 2000)