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thermionic vacuum tube

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

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    Idiom of the Day

    carry coals to Newcastle
    to bring something of which you have much of somewhere, to duplicate something (Newcastle is a town in England where there is much coal)
    Bringing extra food to the farmer`s picnic was like bringing coals to Newcastle.



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    If someone has a skeleton in their closet, they have a secret about their past that they don't want people to know.

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