Where does “placenta” come from?

placenta (Latin) comes from Ancient Greek πλακόεντα, from Ancient Greek πλακοῦς, from Ancient Greek πλακόεις, from Ancient Greek πλάξ, from Proto-Hellenic pləks, from Proto-Indo-European pleh₂- — flat.

placenta (Latin): a round phyllo cake with a ribbed base and a...