(Συέννεσις), a physician of Cyprus, who must have lived in or before the fourth century B. C., as he is mentioned by Aristotle (Aristot. HA 3.2.3), who quotes from his writings a passage on the origin of the veins. This fragment also forms part of the treatise " De Ossium Natura" in the Hippocratic Collection (vol. i. p. 507), which is in fact composed entirely of passages taken from different ancient writers. (See Littré's Oeuvres d'Hippocr. vol. i. p. 419.)