WordReference Random House Unabridged Dictionary of American English © 2026
plac•en•ta•tion
(plas′ən tā′shən),USA pronunciation n.
- Anatomy, Zoology
- the formation of a placenta.
- the manner of placement or construction of a placenta.
- Botanythe disposition or arrangement of a placenta or placentas.
- French; see placenta, -ation
- 1750–60