Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of placental is as below...

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

Placental :: Placental (a.) Of or pertaining to the placenta; having, or characterized by having, a placenta; as, a placental mammal..

Implacental :: Implacental (n.) A mammal having no placenta.

Placentalia :: Placentalia (n. pl.) A division of Mammalia including those that have a placenta, or all the orders above the marsupials..

Implacental :: Implacental (a.) Without a placenta, as marsupials and monotremes..

Aplacental :: Aplacental (a.) Belonging to the Aplacentata; without placenta.

Marsupialia :: Marsupialia (n. pl.) A subclass of Mammalia, including nearly all the mammals of Australia and the adjacent islands, together with the opossums of America. They differ from ordinary mammals in having the corpus callosum very small, in being implacental, and in having their young born while very immature. The female generally carries the young for some time after birth in an external pouch, or marsupium. Called also Marsupiata..

Placental :: Placental (a.) Of or pertaining to the Placentalia.

Placental :: Placental (n.) One of the Placentalia.

Monodelphia :: Monodelphia (n. pl.) The group that includes all ordinary or placental mammals; the Placentalia. See Mammalia.

Lissencephala :: Lissencephala (n. pl.) A general name for all those placental mammals that have a brain with few or no cerebral convolutions, as Rodentia, Insectivora, etc..

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