DICT.TW Dictionary Taiwan

 yolk sac 名詞
 卵黃囊

 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