Ethionic \Eth`i*on"ic\, a. [Ethyl + thionic.] (Chem.)
Pertaining to, derived from, or designating, an acid so
called.
[1913 Webster]
{Ethionic acid} (Chem.), a liquid derivative of
ethylsulphuric and sulphuric (thionic) acids, obtained by
the action of sulphur trioxide on absolute alcohol. Ethiop