placentation

noun

1. Anatomy, Zoology.
   1. the formation of a placenta.
   2. the manner of placement or construction of a placenta.
2. Botany. the disposition or arrangement of a placenta or placentas.

noun

1. botany the way in which ovules are attached in the ovary
2. zoology
   1. the way in which the placenta is attached in the uterus
   2. the process of formation of the placenta

n.

1. Formation of a placenta in the uterus.
2. The type or structure of a placenta.