thiosulfuric acid

Noun

 * 1)  An unstable acid, H$2$S$2$O$3$, formally derived from sulfuric acid by the substitution of a sulfur atom in the place of an oxygen one; it is known only in solution or as its salts and esters, the thiosulfates.

Translations

 * German: Thioschwefelsäure
 * Polish: kwas tiosiarkowy