(Μήδιος), a Greek physician who was a pupil of Chrysippus of Cnidos (Galen, De Ven. Sect. adv. Erasistr. Rom. Dey. 100.2, De Cur. Rat. per Ven. Seet. 100.2, vol. xi. pp. 197, 252), and who lived therefore probably in the fourth and third centuries B. C. Galen says he was held inl good repante among the Greeks (l.c. p. 252), and quotes him apparently as a respectable authority on an anatomical question (Comment. in Hilppor. "De Nat. Hom." 2.6, vol. xv. p. 136). Like the other pupils of Chrysippus, he entirely abstained from blood-letting (Galen, l. c.). He was, perhaps, the brother of Cretoxena, the mother of Erasistratus (Suid. in Ἐρασίστρ), but could not have been much his senior.