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vacuum tube

n.
1.electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

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Word of the Day

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  • vacuum pump
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  • vacuum cleaner
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  • vacuum chamber
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  • rooted
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  • goldoni
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  • veal roast
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    Idiom of the Day

    come down in the world
    to lose one's social position
    My father came down in the world when he decided to change jobs.



    1.
    The doctor (a) / attended to the patient (b) / very quietly. (c) / No error (d)

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