amniotic sac

/ˈæmniˌɑdɪk sæk/
IPA guide

Definitions of amniotic sac
  1. noun
    thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
    synonyms: amnion, amnios
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    type of:
    sac
    a structure resembling a bag in an animal
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