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chelation

n.
1.(medicine) the process of removing a heavy metal from the bloodstream by means of a chelate as in treating lead or mercury poisoning
2.the process of forming a ring by forming one or more hydrogen bonds

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    Idiom of the Day

    pay in advance
    to pay for something before it is received or delivered
    I paid in advance for the frames for my pictures.



    1.
    Choose an idiom to replace the expression in the brackets:
    The company has (deteriorated) since the new president arrived.

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