chorion

cho·ri·on  (kôr-n, kr-)

n.

The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.

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[Greek khorion; see gher- in Indo-European roots.]

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chori·onic (-nk) adj.

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chorion [ˈkɔːrɪən]

n

(Life Sciences & Allied Applications / Anatomy) the outer of two membranes (see also amnion) that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammals

[from Greek khorion afterbirth]

chorionic , chorial adj

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chorion  (kôr-n)

The outer membrane that encloses the embryo of a reptile, bird, or mammal. In mammals, the chorion contributes to the development of the placenta.

Thesaurus

Noun

1.

chorion - the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) amniote - any member of the Amniota chorionic villus - one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk fetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus sac - a structure resembling a bag in an animal