amniotic sac
noun [ C ] medical specialized uk/ˌæm.ni.ɒt.ɪk ˌsæk/ us/ˌæm.ni.ɑː.t̬ɪk ˌsæk/
羊膜囊，胎囊，羊水袋
a bag of liquid that surrounds the embryo of a mammal, bird, or reptile inside its mother
In the centre of the amniotic sac, a little heart was beating away. 在羊膜囊的中心，跳动着一颗小小的心脏。
An amniotic sac contains a fetus during pregnancy. 怀孕期间，胎儿包裹在羊膜囊里。
Synonym: amnion
- More examples
- During pregnancy, the amniotic sac is formed within the uterus and encloses the fetus.
- Part of the membrane around the baby's amniotic sac burst.
- The amniotic sac bursts during the birthing process.