: an electron tube evacuated to a high degree of vacuum
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After graduating from Rensselaer Polytechnic Institute in 1924 with a degree in electrical engineering, DuMont worked in a plant that manufactured vacuum tubes.—IEEE Spectrum, 3 July 2025 This model comes with a vacuum tube, a blower tube, and a collection bag.—Kat De Naoum, Better Homes & Gardens, 31 Oct. 2024 Unlike the giant mainframes of this era, which relied on thousands of vacuum tubes, Simon was compact and animated by a handful of inexpensive relays—simple electrical on/off switches.—IEEE Spectrum, 16 Apr. 2023 The aim of the project is to build a high-speed railway that carries 40-ft (12.2-m) shipping containers in a partial vacuum tube at speeds rivaling that of flight.—Joe Salas, New Atlas, 14 Mar. 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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