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Chorion Definition The chorion is a membrane that develops around the developing fertilized egg. It begins to develop... Read More

Definition noun Twins with separate chorions and amniotic sacs in utero Supplement Twins may be classified according to the... Read More

Definition noun, plural: placentae or placentas (1) (zoology) The vascular organ formed during gestation of female mammals... Read More

Definition noun, plural: fetal membranes A membrane surrounding the embryo or fetus and is involved in nutrition,... Read More

Definition noun, plural: amnions The innermost membrane of the extraembryonic or the fetal membranes of amniotes surrounding... Read More

Definition noun, plural: amniotic sacs Fluid-filled sac where the embryo or fetus is suspended in the uterus or in the of... Read More

Definition noun, singular: twin (1) Two siblings from the same pregnancy and birth (2) (general) Two closely related and... Read More

Definition noun, plural: allantoises or allantoides An embryonic diverticulum of the hindgut of reptiles, birds, and... Read More

Aves Definition What are birds classified as? Birds constitute the class Aves of the kingdom Animalia. How to define Aves?... Read More

Zygote Definition What is a zygote? A zygote is a fertilized eukaryotic cell. In biology, medical science, and other allied... Read More

Definition noun, plural: amniotes Any of the tetrapod vertebrates belonging to Amniota in which an amnion is formed during... Read More

Definition noun, plural: eutherian mammals Any from the group of mammals possessing chorioallantoic placenta (as opposed... Read More

Definition noun, plural: anamniotes Any of the vertebrates that do not belong to the Amniota, and in which an amnion does... Read More

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