theriaca
Could not find theriacen in Logeion dictionaries.
theriacen Noun: feminine accusative singular of theriaca
1 thērĭăca, æ, et thērĭăcē, ēs, f. (θηριακή), thériaque [spécifique contre les morsures venimeuses] : Plin. 20, 264 ; Tert. Anim. 24.