cho·ri·on (kôr  - n , k r-)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 gher  - in Indo-European roots.]cho ri·onic (-n k) adj. |
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
| 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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| 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 |
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