Ărĭdaeus, i, m., = Ἀριδαῖος, a natural son of Philip of Macedon by the dancer Philinna, brother and successor of Alexander the Great, Just. 9, 8; 12, 15 al.; Curt. 10, 17. Also called Philippus, Nep. Phoc. 3, 3; cf. Just. 13, 3.