• WordNet 3.6
    • adj eutherian of or relating to or belonging to the subclass Eutheria "eutherian mammals"
    • n eutherian mammals having a placenta; all mammals except monotremes and marsupials
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Century Dictionary and Cyclopedia
    • eutherian Pertaining to or having characters found in the Eutheria, or placental mammals.
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In literature:

The early Eutherian stock consisted of small mammals with small heads and slender, long tails.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard