THERIAC Meaning of THERIAC in English I. ˈthirēˌak noun( -s )Etymology: New Latin theriaca 1. : theriaca2. : cure-all II. adjectivealso the·ri·a·cal thə̇ˈrīəkəl : antidotal , medicinal Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012