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Webster's 1913 Dictionary

THIOSULPHURIC

Thi `o *sul *phur "ic, a. Etym: [Thio- + sulphuric. ] (Chem. )

 

Defn: Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.