amniotic sac
Definition
noun. a twolayered membrane that surrounds the embryo or fetus in the uterus. It is filled with fluid in which the embryo or fetus is suspended.
Example Sentence
The amniotic sac forms around the embryo during the third week.
Synonyms
membrane; around the embryo; filled with fluid
Antonyms
egg shell
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amniotic sac
