Eth`yl·sul·phu'ric adjective (Chemistry) Pertaining to, or containing, ethyl and sulphuric acid. Ethylsulphuric acid (Chemistry) , an acid sulphate of ethyl, H.C 2 H 5 .SO 4 , produced as a thick liquid by the action of sulphiric acid on alcoh... Found on http://www.encyclo.co.uk/webster/E/71