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amniotic sac is a noun meaning "thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)". It carries one recorded sense.
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
mammal
Definitions, synonyms and semantic relations for amniotic sac come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.