amnios
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) • Syn: amnion, amniotic sac • Derivationally related forms: amniotic (for: amnion), amnionic (for: amnion), amnic (for: amnion) • Topics: mammal, mammalian • Hypernyms: sac • Part Holonyms: amniote, fetal membrane
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