PLACENTAL
placental
(adjective) pertaining to or having or occurring by means of a placenta; “all mammals except monotremes and marsupials are placental mammals”
placental, placental mammal, eutherian, eutherian mammal
(noun) mammals having a placenta; all mammals except monotremes and marsupials
Source: WordNet® 3.1
Etymology
Adjective
placental (not comparable)
Of or pertaining to the placenta, or to the Placentalia
Having a placenta.
Noun
placental (plural placentals)
Any animal that is a member of the Placentalia
Source: Wiktionary
Pla*cen"tal, a.
1. Of or pertaining to the placenta; having, or characterized by
having, a placenta; as, a placental mammal.
2. (Zoöl.)
Definition: Of or pertaining to the Placentalia.
Pla*cen"tal, n. (Zoöl.)
Definition: One of the Placentalia.
Source: Webster’s Unabridged Dictionary 1913 Edition