a.1.(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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.