chorion

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cho·ri·on

 (kôr′ē-ŏn′)
n.
The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.

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

cho′ri·on′ic (-ŏn′ĭk) adj.

chorion

(ˈkɔːrɪən)
n
(Anatomy) the outer of two membranes that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammals. See also amnion
[C16: from Greek khorion afterbirth]
ˌchoriˈonic, ˈchorial adj

cho•ri•on

(ˈkɔr iˌɒn, ˈkoʊr-)

n.
1. the outermost of the membranes enclosing the embryo in reptiles, birds, and mammals, developing into part of the eggshell or part of the placenta.
2. a membrane enclosing the shell of an insect egg.
[1535–45; < Greek chórion afterbirth]
cho`ri•on′ic, cho′ri•al, adj.

cho·ri·on

(kôr′ē-ŏn′)
The outer membrane that encloses the embryo of a reptile, bird, or mammal. In mammals, the chorion contributes to the development of the placenta.

chorion

The embryo’s outer membrane, which helps to form the placenta.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
Translations

cho·ri·on

n. corión, una de las dos membranas que rodean al feto.