Emily Dickinson Lexicon

THE'RI-AC, n. [L. theriaca, Gr. θηριακη, treacle.]

A name given by the ancients to various compositions esteemed efficacious against the effects of poison, but afterward restrained chiefly to what has been called Theriaca Andromachi, or Venice treacle, which is a compound of sixty-four drugs, prepared, pulverized, and reduced by means of honey to an electuary. Cyc.