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yolk sac

n.
1.membranous structure that functions as the circulatory system in mammal embryos until the heart becomes functional
2.membranous structure enclosing the yolk of eggs in birds reptiles marsupials and some fishes

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  • Idiom of the Day

    get to one's feet
    to stand up
    The members of the audience got to their feet when the concert finished.



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