from The Century Dictionary.

  • Placental mammals; those mammals which are placentate or placentiferous: distinguished from Implacentalia.

from the GNU version of the Collaborative International Dictionary of English.

  • noun plural (Zoöl.) A division of Mammalia including those that have a placenta, or all the orders above the marsupials.


Sorry, no etymologies found.


  • As the large and blood-filled vascular network of the foetal allantois attaches itself closely to the mucous lining of the maternal womb, and the partition between the blood-vessels of mother and child becomes much thinner, we get that remarkable nutritive apparatus of the foetal body which is characteristic of the placentalia (or choriata).

    The Evolution of Man — Volume 1


Log in or sign up to get involved in the conversation. It's quick and easy.