\Eth`yl*sul*phu"ric\a. (Chem.)
Pertaining to, or containing, ethyl and sulphuric acid.
{Ethylsulphuric acid} (Chem.), an acid sulphate of ethyl,
   {H.C2H5.SO4}, produced as a thick liquid by the action of
   sulphiric acid on alcohol. It appears to be the active
   catalytic agent in the process of etherification.