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[kawr-ee-oh-uh-lan-toh-is, ‐tois, kohr‐] /ˌkɔr i oʊ əˈlæn toʊ ɪs, ‐tɔɪs, ˌkoʊr‐/

noun, Embryology, Zoology.
a vascular, extraembryonic membrane of birds, reptiles, and certain mammals, formed by the fusion of the wall of the chorion with the wall of the allantois.

chorioallantois cho·ri·o·al·lan·to·is (kôr’ē-ō’ə-lān’tō-ĭs)
The highly vascular extraembryonic membrane formed by the fusion of the allantois with the chorion that constitutes the placenta in most mammals.
cho’ri·o·al’lan·to’ic (-ō-āl’ən-tō’ĭk) adj.


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  • Chorioangioma

    chorioangioma cho·ri·o·an·gi·o·ma (kôr’ē-ō-ān’jē-ō’mə) n. A benign tumor of placental blood vessels usually of no clinical significance.

  • Chorioangiosis

    chorioangiosis cho·ri·o·an·gi·o·sis (kôr’ē-ō-ān’jē-ō’sĭs) n. An abnormal increase in the number of vascular channels that are present in the villi of the placenta; severe chorioangiosis is associated with a high incidence of neonatal death and major congenital malformations. Also called chorioangiomatosis.

  • Choriocapillaris

    choriocapillaris cho·ri·o·cap·il·lar·is (kôr’ē-ō-kāp’ə-lār’ĭs) n. The capillaries forming the inner vascular layer of the choroid of the eye.

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