previllous embryo


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pre·vil·lous em·bry·o

the embryo of a placental mammal prior to the formation of chorionic villi.

previllous embryo

[prēvil′əs]
Etymology: L, prae + villus, hairy; Gk, en, in, bryein, to grow
an embryo of a placental mammal at any stage before the development of the chorionic villi, which in humans occurs between the first and second months after fertilization.
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