n :  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 by cyanides or iodine, in the treatment of tinea versicolor, and to prevent ringworm (as in a footbath) - called also hypo , odium hyposulfite  .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.