(Διοκλῆς ὁ Καρύστιος), a very celebrated Greek physician, was born at Carystus in Euboea, and lived in the fourth century B. C., not long after the time of Hippocrates, to whom Pliny says he was next in age and fame. (H. N. 26.6.) He belonged to the medical sect of the Dogmatici (Gal. de Aliment. Facult. 1.1, vol. vi. p. 455).
Some persons have attributed to Diocles the honour of first explaining the difference between the veins and arteries; but this does not seem to be correct, nor is any great discovery connected with his name.
[W.A.G]