Eutheria

Eutheria is a taxon containing the placental mammals, such as humans. The sister group of Eutheria is Metatheria, which includes marsupials and their extinct relatives.The name Eutheria comes from the Greek words eu- "well-developed" and ther "beast". When Eutheria was introduced by Thomas Henry Huxley in 1880, he meant for it to be more broad in definition than its precursor Placentalia. Some use Eutheria as a total group which includes the crown group Placentalia and extinct mammals which are closer to Placentalia than to Marsupialia.
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Noun
1. all mammals except monotremes and marsupials
(synonym) subclass Eutheria
(hypernym) class
(member-holonym) Mammalia, class Mammalia
(member-meronym) placental, placental mammal, eutherian, eutherian mammal

Placental mammals. A subclass of the Class Mammalia (others are monotremes and marsupials). Embryo and fetus are nourished by a placenta. They are viviparous (producing young alive rather than lying eggs), have a long period of gestation and the young is born immature.

eutheria /ju:'θi:əriə/
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