Definitions
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.
Etymologies
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Examples
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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 Ernst Heinrich Philipp August Haeckel 1876
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