- 1. n. A thin membrane surrounding the embryos of mammals, birds, and reptiles. Source: opted
- 2. n. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) Source: wordnet
- 3. A thin membrane surrounding the embryos of mammals, birds, and reptiles. Source: webster
- 4. A thin membrane surrounding the embryos of mammals, birds, andreptiles. Source: adambom
- 5. n. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) Source: ecdict
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amnion
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birdsmammalsthinreptilesembryosmembranesurroundingdevelopingembryoenclosinghigherinnermostmembranoussacvertebrates