thiosulfuric
thio.sul.fu.ric \-.s*l-'fyu.(*)r-ik\ aj : of, relating to, or being an unstable acid H2S2O3 der ived from sulfuric acid by replacement of one oxygen atom by sulfur and known only in solution or in salts and esters
Webster's English Dictionarythio.sul.fu.ric \-.s*l-'fyu.(*)r-ik\ aj : of, relating to, or being an unstable acid H2S2O3 der ived from sulfuric acid by replacement of one oxygen atom by sulfur and known only in solution or in salts and esters