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2 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 amniotic sac 名詞
 羊膜,羊膜囊

From: WordNet (r) 2.0

 amniotic sac
      n : thin innermost membranous sac enclosing the developing
          embryo of higher vertebrates (reptiles, birds and
          mammals) [syn: amnion, amnios]