a. Chem. [f. AL(COHOL) + Gr. θεῖον sulphur + -IC.] In Althionic Acid, C2H4SO4, produced, according to Regnault, by heating alcohol with an excess of strong sulphuric acid.
1858. in Penny Cycl., 2nd Supp. 126/2.
1863. Watts, Dict. Chem., I. 149. The barium-salt of althionic acid.