Eutheria
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Eu·the·ri·a
(yū-thē'rē-ă),A subclass of mammals, excluding monotremes and marsupials, having a placenta through which the young are nourished.
[eu- + G. thērion, animal]
Eutheria
(ū-thēr′ē-ă)A subclass of mammals with a true placenta.