/ˌæmniəʊsenˈti:sɪs ||; ˌæmnɪosɛnˈtisɪs/noun [U] [sing] a medical test in which some liquid is taken from a pregnant woman'sWOMB(= the part where a baby grows before it is born)to find out if the baby has particular illnesses or health problems 羊膜穿刺术（用于检查胎儿是否有某种病或健康问题）