Prenatal tests, for short

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

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 ]