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yolk sac
 
Noun yolk sac has 2 senses
  1. yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus - membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
    --1 is a kind of sac
  2. yolk sac - membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes; circulates nutrients to the developing embryo
    --2 is a kind of     sac
yoko ono yokohama yokokusa yokuts yolanda yolande yolk yolk of an egg with two tablespoons yolk sac yolt yom yom kippur yom kippur war yom kipur yomim yomsippity yon

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