Definition of amniocentesis noun from the Oxford Advanced Learner's Dictionary

 

amniocentesis

 noun
noun
BrE BrE//ˌæmniəʊsenˈtiːsɪs//
 
; NAmE NAmE//ˌæmnioʊsenˈtiːsɪs//
 
[uncountable, singular]
 
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a medical test that involves taking some liquid from a pregnant woman’s womb 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. Word Origin 1950s: from amnion(mid 17th cent.: from Greek, ‘caul’, diminutive of amnos ‘lamb’) + Greek kentēsis ‘pricking’ (from kentein ‘to prick’).
See the Oxford Advanced American Dictionary entry: amniocentesis