from the GNU version of the Collaborative International Dictionary of English

  • The group that includes all ordinary or placental mammals; the Placentalia. See mammalia.

from The Century Dictionary and Cyclopedia

  • n. The highest of three primary divisions of mammals, or subclasses of the class Mammalia (the other two being Didelphia and Ornithodelphia); placental mammals, or Placentalia.


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