PLACENTAL
Pla*cen"tal, n. (Zoöl.)
Defn: One of the Placentalia.
PLACENTALIA
Plac`en*ta"li*a, n. pl. Etym: [NL.] (Zoöl.)
Defn: A division of Mammalia including those that have a placenta, or all the orders above the marsupials.
PLACENTARY
Pla*cen"ta*ry, a.
Defn: Having reference to the placenta; as, the placentary system of classification.
PLACENTATION
Plac`en*ta"tion, n.
1. (Anat.)
Defn: The mode of formation of the placenta in different animals; as, the placentation of mammals.
2. (Bot.)