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chorioallantois

(kôr′ē ō′ə lantō is)

noun

an enveloping vascular fetal membrane formed by the fusion of chorion and allantois in reptiles, birds, and most mammals: that of chicks is used as a culture medium for growing viruses

Origin: ModL: see chorion & allantois

Related Forms:

See chorioallantois in American Heritage Dictionary 4

noun
The highly vascular fetal membrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals.

Related Forms:

  • choˌri·o·alˌlan·toˈic (-ō-ălˌən-tōˈĭk) adjective

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