amnion
am·nion
noun
1.
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
Origin
From Latin amnion (“membrane around a fetus”), from Ancient Greek ἀμνίον (amníon).
Related words
Word family
Broader terms
Parts
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.