Thesaurus: yolk sac
membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
Related headwords
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Definitions
- n. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
- n. membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo