: an electron tube evacuated to a high degree of vacuum
Examples of vacuum tube in a Sentence
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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 intent of their research effort was to develop a technology to replace vacuum tubes that powered communications networks.—Scott D. Anthony, Fortune, 29 Nov. 2025 The idea isn't new, but Epirus has improved on previous iterations by using Gallium Nitride (GaN) semiconductors to generate microwaves instead of fragile, power-hungry magnetron vacuum tubes.—New Atlas, 27 Sep. 2025 See All Example Sentences for vacuum tube
: 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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