a. Chem. [f. E(THER) + Gr. θεῖον sulphur + -IC.
Formed by Magnus in 1833, in imitation of the terms proto-, deuto-, trito-œnothionic [Gr. οἶνος wine, introduced by Sertuernor (1818), to designate three acids, one of which Magnus supposed to have been identical with ethionic acid.]
Ethionic acid: C2 H6 S2 O7 (Watts, Dict. Chem.) produced by the action of water on Ethionic anhydride, C2 H4 2 SO3, formerly called Sulphate of carbyl (Watts, Dict. Chem.), which is obtained by bringing together olefiant gas and vapor of sulphuric anhydride in a tube.
1838. T. Thomson, Chem. Org. Bodies, 190. Of Ethionic Acid.
1877. Watts, Fownes’ Chem., II. 174. Ethionic Anhydride.
