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yolk sac
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English Dictionary: yolk sac by the DICT Development Group
1 result for yolk sac
From WordNet (r) 3.0 (2006) [wn]:
yolk sac
n
  1. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
    Synonym(s): yolk sac, 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
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