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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

    out of consideration for (someone or something)
    thinking about someone's feelings or needs, considering someone's feelings or needs
    The police did not release the names of the accident victims out of consideration for the family members.



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