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Search Result:yolk sac




Overview of noun yolk_sac

The noun yolk sac has 2 senses


  • yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus -- (membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional)

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