Synonyms: eutherian, eutherian mammal, placental, placental mammal
Definition: mammals having a placenta; all mammals except monotremes and marsupials
Similar words: mammal, mammalian
Definition: any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
Definition: (noun) a manner lacking seriousness
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