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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

    take the plunge
    to do something decisive (such as getting married)
    My friend will take the plunge and get married next year.



    1.
    Claude felt particularly ________ as he carried the large satchel filled with cash through the dark streets to the bank.

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