The Collaborative International Dictionary of English v.0.48:

Sulphocarbonic \Sul`pho*car*bon"ic\, a. (Chem.)
   Of, pertaining to, or designating, a sulphacid, H2CSO2
   (called also thiocarbonic acid), or an acid, H2CS3,
   analogous to carbonic acid, obtained as a yellow oily liquid
   of a pungent odor, and forming salts.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Thiocarbonic \Thi`o*car*bon"ic\, a. [Thio- + carbonic.] (Chem.)
   Same as Sulphocarbonic.
   [1913 Webster]