Philo or -on, ōnis, m., = Φίλων. An Academic philosopher of Athens, teacher of Cicero about A. U. C. 663, Cic. Brut. 89, 306; id. Ac. 2, 6, 17; id. Tusc. 2, 3, 9; 5, 37, 107; id. N. D. 1, 40, 113.

— A celebrated architect in Athens, Cic. de Or. 1, 14, 62; Vitr. 7 praef. § 12; cf. Sillig, Catal. Artif. s. h. v.

— A Greek physician, a native of Tarsus, the inventor of an eye-salve, Cels. 6, 6, 3.

—Hence, adj.: Philōniānus, a, um, of Philo: Philonianum antidotum, Marc. Emp. 20.

—As subst.: Philōnium, i, n., the same, Ser. Samm. 22, 396.

— A Roman surname: Q. Publicius Philo, consul A. U. C. 439, Inscr. Grut. 291.