Isethionic \I*seth`i*on"ic\, a. [Is- + ethionic.] (Chem.)
Pertaining to, derived from, or designating, an acid,
{HO.C2H4.SO3H}, obtained as an oily or crystalline substance,
by the action of sulphur trioxide on alcohol or ether. It is
derivative of sulphuric acid.
[1913 Webster]