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opsonin

n.
1.an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes

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    Idiom of the Day

    wait up (for someone)
    to not go to bed until someone arrives or something happens
    The woman always waits up for her daughter when she comes home late at night.



    1.
    He needs something to ________ his leisure hours.

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