1. The vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing foetus
   "The doctor examined the placenta after delivery to ensure it was complete"
    
2. That part of the ovary of a flowering plant where the ovules form
   "The placenta provides nutrients to the developing ovules"

Derived forms: placentas, placentae

Type of: reproductive structure, vascular structure

Part of: ovary, uterus, womb

Encyclopedia: Placenta