am ‧ ni ‧ o ‧ cen ‧ te ‧ sis /ˌæmniəʊsenˈtiːsəs, ˌæmniəʊsenˈtiːsɪs $ -nioʊ-/ BrE AmE noun [uncountable]
[ Date: 1900-2000 ; Language: Modern Latin ; Origin: amnion ( AMNIOTIC ) + centesis 'making a hole' (from Greek , from kentein 'to prick' ) ]
a test to see if an unborn baby has a disease or other problem, done by taking liquid from the mother’s ↑ womb