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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

    shoot up
    to grow quickly
    The boy seemed to shoot up quickly during the summer.



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    A Bohemian army general was so devoted to his country that when he died he asked for his skin to be removed and made into a drum that could be beaten in defiance of Bohemia's enemies. It was used nearly 200 years later at the start of the Thirty Years War in 1618.      .. More >>
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