platy som us

[Greek platysōmos =having a broad body.] Palæont .:. A genus of Ganoid Fishes, from the Devonian to the Permian. plăt-y-ster-non, subst. [Prefix platy-, and Gr. stern on the breast.] Zool.: A genus of Emydes, from China. Platy stern on megacephalum is the Large-headed Chinese River Tortoise.