Definition of placentalian in English:

placentalian

adjective

rare
  • Of or relating to the division Placentalia; eutherian.

Origin

Mid 19th century; earliest use found in Louis Agassiz (1807–1873), zoologist and geologist. From Placentalia or its etymon scientific Latin Placentalia + -an.

Pronunciation

placentalian

/ˌplas(ə)nˈteɪlɪən/