that part of the ovary of a flowering plant where the ovules form
"The botanist explained how the placenta in the apple's core is the tissue from which all the seeds develop."
the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus
"The doctor explained that the placenta acts as a vital lifeline, supplying oxygen to the baby while removing its waste products until birth."
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.
"During her prenatal checkup, Dr. Lee explained that the placenta acts as a vital lifeline by filtering oxygen and nutrients from her bloodstream before being delivered shortly after childbirth."