Any of various mammals of the infraclass Eutheria, including all of the species, such as primates, carnivores, whales, ruminants, bats, and rodents, in which the female bears live young that are nourished before birth by means of a complex placenta. Also called placental mammal .
Origin of eutherianFrom New Latin Euthēria infraclass name Greek eu- eu- Greek thēria pl. of thērion wild animal ; see treacle .
- a eutherian animal.
From Eutheria, from Ancient Greek Îµá½– (eu, “good, true") + Î¸Î·ÏÎ¯Î¿Î½ (thÄ“rion, “beast").