Lewis & Short

Actĭăcus, a um, adj. [Actium], relating to Actium: victoria, at Actium, Suet. Aug. 18: ludi, the games which Augustus revived at Actium in honor of his victory, id. Tib. 6: Phoebus, who had a temple here, Ov. M. 13, 715: acquor, id. H. 15, 166: legiones, which had fought at Actium, Tac. A. 1, 42.