{ The″ri‐ac (?), ‖The‐ri″a‐ca (?), } n. [L. theriaca an antidote against the bite of serpents, Gr. �: cf. F. thériaque. See Treacle.] 1. (Old Med.) An ancient composition esteemed efficacious against the effects of poison; especially, a certain compound of sixty-four drugs, prepared, pulverized, and reduced by means of honey to an electuary; — called also theriaca Andromachi, and Venice treacle.
2. Treacle; molasses. British Pharm.
{ The″ri‐ac (?), The‐ri″a‐cal (?), } a. [Cf. F. thériacal.] Of or pertaining to theriac; medicinal. “Theriacal herbs.” Bacon.