sodium thiosulfate

noun

: a hygroscopic crystalline salt Na₂S₂O₃ used especially as a photographic fixing agent and a reducing or bleaching agent

called also fixer, hypo

Word History

First Known Use

1885, in the meaning defined above

Kids Definition

sodium thiosulfate

noun

sodium thio·​sul·​fate

-ˌthī-ə-ˈsəl-ˌfāt

: a chemical compound used especially in photography to make images permanent and in bleaching

Medical Definition

sodium thiosulfate

noun

: a hygroscopic crystalline salt Na₂O₃S₂ that is used as a fixing agent in photography, as a reducing agent and bleaching agent, in chemical analysis for the titration of iodine, and in medicine as an antidote in poisoning especially by cyanides and as an antifungal agent

called also hypo, sodium hyposulfite