English dictionary



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English noun: yolk sac

1. yolk sac (animal) membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional


Synonymsumbilical vesicle, vesicula umbilicus, vitelline sac


Broader (hypernym)sac

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


Broader (hypernym)sac









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