yolk sac

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• March 5. 2016 from wordnet.princeton.edu

  yolk sac — noun — english

  membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional

• March 5. 2016 from wordnet.princeton.edu

  yolk sac — noun — english

  membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo