Definitions for placental
Random House Webster's College Dictionary
pla•cen•ta*pləˈsɛn tə(n.)(pl.)-tas, -tae
the organ in most mammals, formed in the lining of the uterus by the union of the uterine mucous membrane with the membranes of the fetus, that provides for the nourishment of the fetus and the elimination of its waste products.
Category: Anatomy, Zoology
the part of the ovary of flowering plants that bears the ovules. (in ferns and related plants) the tissue giving rise to sporangia.
Origin of placenta:
1670–80; < NL: something having a flat, circular form, L: a cake < Gk plakóenta, acc. of plakóeis flat cake, der. of pláx (gen. plakós) flat
placental, placental mammal, eutherian, eutherian mammal(adj)
mammals having a placenta; all mammals except monotremes and marsupials
pertaining to or having or occurring by means of a placenta
"all mammals except monotremes and marsupials are placental mammals"
Any animal that is a member of the Placentalia
Of or pertaining to the placenta, or to the Placentalia
Having a placenta
of or pertaining to the placenta; having, or characterized by having, a placenta; as, a placental mammal
of or pertaining to the Placentalia
one of the Placentalia