Etymology
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placental (adj.)

"of or pertaining to a placenta," 1784, from Modern Latin placentalis, from placenta (see placenta).

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Definitions of placental
1
placental (n.)
mammals having a placenta; all mammals except monotremes and marsupials;
Synonyms: placental mammal / eutherian / eutherian mammal
2
placental (adj.)
pertaining to or having or occurring by means of a placenta;
all mammals except monotremes and marsupials are placental mammals
From wordnet.princeton.edu