1. Thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
   - amnion, amniotic sac

1. (pregnancy) extraction by centesis of amniotic fluid from a pregnant woman (after the 15th week of pregnancy) to aid in the diagnosis of foetal abnormalities
   - amniocentesis

Type of: centesis, prenatal diagnosis, sac

Part of: amniote, fetal membrane

Encyclopedia: Amnio

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