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Yolk sac   /joʊk sæk/   Listen
Yolk sac

noun
1.
Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional.  Synonyms: umbilical vesicle, vesicula umbilicus, vitelline sac.
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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Words linked to "Yolk sac" :   vitelline sac, sac, umbilical vesicle, vesicula umbilicus


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