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amniocentesis

noun [U or S]
 
 
/ˌæm.ni.əʊ.senˈtiː.sɪs/ US  /-oʊ-/

Definition

a medical test in which a needle is used to remove a small amount of the liquid that surrounds a baby in the mother's womb in order to examine the baby's conditionPregnancyBirth
(Definition of amniocentesis noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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