thiosulfuric
adjective
thio·sul·fu·ric
variants:
or chiefly British thiosulphuric \ -ˌsəl-ˈfyu̇(ə)r-ik 
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Medical Definition of thiosulfuric
: of, relating to, or being an unstable acid H2S2O3 derived from sulfuric acid by replacement of one oxygen atom by sulfur and known only in solution or in salts and esters