English dictionary amniotic sac meaning and definition Definition and meaning of amniotic sac at MeaningMonkey.org. amniotic sac meaning and definition in the English Dictionary. AMNIOTIC SAC nounDefinition of amniotic sac (noun)thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)synonyms: amnion, amnios Source: Princeton University Wordnet
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