DictionaryRoot: amnion
Greek
amnion
membrane around a fetus
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noun
amniocentesis
am-nee-oh-sen-TEE-sis/ˌæmniəʊsenˈtiːsɪs/
A prenatal test in which a needle removes a sample of fluid surrounding the fetus.
Etymology
The name combines the fetal membrane with a puncture: a needle withdraws fluid from around the fetus for testing. It names the sampling procedure used in the prenatal test.