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2 definitions found

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

 yolk sac 名詞
 卵黃囊

From: WordNet (r) 2.0

 yolk sac
      n 1: membranous structure that functions as the circulatory
           system in mammal embryos until the heart becomes
           functional [syn: vitelline sac, umbilical vesicle, vesicula
            umbilicus]
      2: membranous structure enclosing the yolk of eggs in birds
         reptiles marsupials and some fishes; circulates nutrients
         to the developing embryo