Definition of placenta

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Placenta (n.) The vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth..

Lern More About Placenta

Metadiscoidal :: Metadiscoidal (a.) Discoidal by derivation; -- applied especially to the placenta of man and apes, because it is supposed to have been derived from a diffused placenta..
Implacental :: Implacental (a.) Without a placenta, as marsupials and monotremes..
Monodelphia :: Monodelphia (n. pl.) The group that includes all ordinary or placental mammals; the Placentalia. See Mammalia.
Aplacentata :: Aplacentata (n. pl.) Mammals which have no placenta.
Ovule :: Ovule (n.) The rudiment of a seed. It grows from a placenta, and consists of a soft nucleus within two delicate coatings. The attached base of the ovule is the hilum, the coatings are united with the nucleus at the chalaza, and their minute orifice is the foramen..
Implacental :: Implacental (n.) A mammal having no placenta.
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..
Placenta :: Placenta (n.) The vascular appendage which connects the fetus with the parent, and is cast off in parturition with the afterbirth..
Placentation :: Placentation (n.) The mode in which the placenta is arranged or composed; as, axile placentation; parietal placentation..
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..
Decidua :: Decidua (n.) The inner layer of the wall of the uterus, which envelops the embryo, forms a part of the placenta, and is discharged with it..
Placental :: Placental (n.) One of the Placentalia.
Parietal :: Parietal (a.) Attached to the main wall of the ovary, and not to the axis; -- said of a placenta..
Secundine :: Secundine (n.) The afterbirth, or placenta and membranes; -- generally used in the plural..
Zonaria :: Zonaria (n. pl.) A division of Mammalia in which the placenta is zonelike.
Placentary :: Placentary (a.) Having reference to the placenta; as, the placentary system of classification..
Placentiform :: Placentiform (a.) Having the shape of a placenta, or circular thickened disk somewhat thinner about the middle..
Spermaphore :: Spermaphore (n.) That part of the ovary from which the ovules arise; the placenta.
Cotyledonary :: Cotyledonary (a.) Having a cotyledon; tufted; as, the cotyledonary placenta of the cow..
Trophosperm :: Trophosperm (n.) The placenta.
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