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amniocentesis

am·ni·o·cen·te·sis [ àmnee ō sen tssiss ] (plural am·ni·o·cen·te·ses [ àmnee ō sen t sz ])


noun 
Definition:
 
test done on fetus: a test performed to determine the health, sex, or genetic constitution of a fetus by taking a sample of amniotic fluid through a needle inserted into the womb of the mother

[Mid-20th century. <amnion + Greek kentēsis "pricking" (from kentein "prick")]
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