Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n.pl. A primary division of the Mammalia, including the monotremes and marsupials, in which no placenta is formed.

from The Century Dictionary and Cyclopedia

  • A group of mammalia constituted by the marsupials and monotremes, representing the subclasses Didelphia and Ornithodelphia, as together contrasted with the Placentalia or Monodelphia.

Etymologies

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