Do you really want to send Webster 1913 a message saying you like their work?
Thi`o*sul*phur"ic (?), a. [Thio- + sulphuric.] Chem.
Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.
© Webster 1913.