placental

From post-classical Latin placentalis, corresponding to placenta +‎ -al.

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placental (not comparable)

1. Of or pertaining to the placenta. [from 18th c.]
2. (zoology) Pertaining to the Placentalia, comprising those mammals not marsupials or monotremes. [from 19th c.]
   • 2022, Thomas Halliday, Otherlands, Penguin, published 2023, page 103:

     We do not know exactly how many placental lineages survived to leave descendants; most estimates are around ten.

placental (plural placentals)

1. Any animal that is a member of the Placentalia

placental (not comparable)

1. placental

• placenta