| NOUN | animal | amniotic sac, amnion, amnios | thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) |
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| Meaning | Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals). | |
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| Synonyms | amnion, amnios | |
| Category | mammal, mammalian | Any warm-blooded vertebrate having the skin more or less covered with hair |
| Part of | amniote | Any member of the Amniota |
| fetal membrane | Any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus | |
| Broader | sac | A structure resembling a bag in an animal |
| Spanish | amnios | |
| Catalan | amni, amnios, bossa amniòtica | |
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