of, relating to, or belonging to the Eutheria, a subclass of mammals all of which have a placenta and reach an advanced state of development before birth. The group includes all mammals except monotremes and marsupials
noun
2.
any eutherian mammal
Compare metatherian, prototherian
Word origin
C19: from New Latin Euthēria, from Greek eu- + thēria, plural of thērion beast