 amniotic_sac |
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| 1. | [ noun ] (botany,anatomy,zoology,embryology) thin innermost membranous sac enclosing the developing embryo in higher vertebrates (Amniota: reptiles; birds; mammals) | |
| Synonyms: | amnios amnion | |
| Related terms: | sac membrane amniote fetal_membrane mammal | |
| Similar spelling: |
amniotic_cavity amniotic_fluid |
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