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.
Definition of placentalian in US English:
placentalian
adjectiveˌplas(ə)nˈteɪlɪən
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.