Placentation

n.	1.	(Anat.) The mode of formation of the placenta in different animals; as, the placentation of mammals.
	2.	(Bot.) The mode in which the placenta is arranged or composed; as, axile placentation; parietal placentation.

Noun	1.	placentation - the formation of the placenta in the uterus
	2.	placentation - arrangement of the ovules in the placenta and of the placentas in the ovary

activity, bodily function, bodily process, body process