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

amniocentesis

noun
 
/ˌæmniəʊsenˈtiːsɪs/
 
/ˌæmniəʊsenˈtiːsɪs/
[uncountable, singular]
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  1. 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 Origin1950s: from amnion(mid 17th cent.: from Greek, ‘caul’, diminutive of amnos ‘lamb’) + Greek kentēsis ‘pricking’ (from kentein ‘to prick’).
See amniocentesis in the Oxford Advanced American Dictionary
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