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yolk sac

2 senses · Free VividLex dictionary · Thesaurus

1. n. membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional Source: wordnet
2. n. membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo Source: wordnet

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membranous structure yolk becomes birds circulates circulatory developing eggs embryo embryos enclosing fishes functional functions heart mammalian marsupials nutrients reptiles system until

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yoking Yoko Onoed

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