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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  • Sodium thiosulphate

    noun 1. a white soluble substance used, in the pentahydrate form, in photography as a fixer to dissolve unchanged silver halides and also to remove excess chlorine from chlorinated water. Formula: Na2S2O3 Also called (not in technical usage) sodium hyposulphite, hypo

  • Sodium-tripolyphosphate

    [trahy-pol-ee-fos-feyt] /ˌtraɪ pɒl iˈfɒs feɪt/ noun, Chemistry. 1. a white powder, Na 5 P 3 O 1 0 , used as a water softener, sequestering agent, and food additive.

  • Sodium-vapor lamp

    [soh-dee-uh m-vey-per] /ˈsoʊ di əmˌveɪ pər/ noun, Electricity. 1. an electric lamp in which sodium vapor is activated by current passing between two electrodes, producing a yellow, glareless light: used on streets and highways.

  • Sodium-vapour lamp

    noun 1. a type of electric lamp consisting of a glass tube containing neon and sodium vapour at low pressure through which an electric current is passed to give an orange light. They are used in street lighting

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