Definition of vacuum tube in English:

vacuum tube

Line breaks: vac¦uum tube

noun

  • A sealed glass tube containing a near-vacuum which allows the free passage of electric current.
    More example sentences
    • A photocell is usually a vacuum tube with two electrodes.
    • In 1948 the vacuum tube was replaced by longer-lived solid-state transistors, marking the dawn of microelectronics.
    • We think of the 1950s as the golden era of the vacuum tube.

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