Ăchĕrontĭcus, a, um, adj.,
belonging to the Acheron or the Lower World : stagna, Prud. Cath. 5, 127: libri, sacred books , written , according to tradition , by the Etruscan Tages , prob. relating to the Acherontian rites of the dead, Arn. adv. Gent. 2, p. 87; cf. Serv. ad Aen. 8, 398; and Müll. Etrusc. 1, p. 77.