vacuum tube

noun

: an electron tube evacuated to a high degree of vacuum

Examples of vacuum tube in a Sentence

Recent Examples on the Web
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That model was unlike anything else on the market at the time, with separate amplifier circuits for cleaner separation in each channel, and a vacuum tube preamp stage for analog smoothness and warmth – sort of emulating an audiophile's full system setup. New Atlas, 17 Feb. 2026 Officials say the same core technology could eventually support space launch systems and vacuum tube transport concepts. Sujita Sinha, Interesting Engineering, 26 Dec. 2025 The transistors were smaller, used less power and generated less heat than previous vacuum tubes. Christopher Howley, AZCentral.com, 23 Dec. 2025 The most imposing of these was a Burroughs Datatron 205, a computer first manufactured in the mid-1950s and based on vacuum tubes. IEEE Spectrum, 12 Dec. 2025 See All Example Sentences for vacuum tube

Word History

First Known Use

1859, in the meaning defined above

Time Traveler
The first known use of vacuum tube was in 1859

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Cite this Entry

“Vacuum tube.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vacuum%20tube. Accessed 20 Feb. 2026.

Kids Definition

vacuum tube

noun
: an electron tube from which most of the air has been removed

Medical Definition

vacuum tube

noun
: an electronic device in which conduction by electrons takes place through a vacuum within a sealed glass or metal container and which has various uses based on the controlled flow of electrons

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