thiocarbonic

from 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]

from The Collaborative International Dictionary of English v.0.48

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