Mammals)

• Birds
• Thin innermost membranous sac enclosing the developing embryo in higher vertebrates (Amniota reptiles
• Tests done by OBs
• Tests done by OB-GYNs
• Prenatal procedures, informally
• Some pregnancy tests, for short
• Short medical procedures?

Wiktionary Word definitions in Wiktionary
n. (context anatomy English) amnion

WordNet Word definitions in WordNet
n. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) [syn: amnion , amniotic sac ]