chorion

Từ điển Oxford Learners Wordfinder Dictionary

noun

the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
• Derivationally related forms:
chorionic
• Topics:
mammal, mammalian
• Hypernyms:
sac
• Part Holonyms:
amniote, fetal membrane
• Part Meronyms:
chorionic villus