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Definition of amniocentesis noun from the Oxford Advanced American Dictionary

 

amniocentesis

 noun
noun
NAmE//ˌæmnioʊsɛnˈtisəs//
 
[uncountable, singular]
 
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a medical test that involves taking some liquid from a pregnant woman's uterus in order to find out if the baby has particular illnesses or health problems Pregnant women over the age of 35 will be offered (an) amniocentesis.
See the Oxford Advanced Learner's Dictionary entry: amniocentesis