| Definition of 'Marsupialia' |
Princeton's WordNet |
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1. (noun) Marsupialia, order Marsupialia
coextensive with the subclass Metatheria
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| Definition of 'Marsupialia' |
Webster Dictionary |
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1. Marsupialia
a subclass of Mammalia, including nearly all the mammals of Australia and the adjacent islands, together with the opossums of America. They differ from ordinary mammals in having the corpus callosum very small, in being implacental, and in having their young born while very immature. The female generally carries the young for some time after birth in an external pouch, or marsupium. Called also Marsupiata
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| Definition of 'Marsupialia' |
U.S. National Library of Medicine |
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1. Marsupialia
An infraclass of MAMMALS, also called Metatheria, where the young are born at an early stage of development and continue to develop in a pouch (marsupium). In contrast to Eutheria (placentals), marsupials have an incomplete PLACENTA.
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Definitions of Marsupialia 
