A vascular organ in mammals, except monotremes and marsupials, present only in the female during gestation. It supplies food and oxygen from the mother to the foetus, and passes back waste. It is implanted in the wall of the uterus and links to the foetus through the umbilical cord. It is expelled after birth.
User Defined Definitions
"that part of the ovary of a flowering plant where the ovules form"
"the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus"