1. x-ray tube\x"-ray" tube\ (physics) a vacuum tube suitable for producing r?ntgen rays.x-ray tube a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of x rays [syn: x-ray tube]. 2. a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays. 3. A vacuum tube containing electrodes that accelerate electrons and direct them to a metal anode, where their impacts produce x-rays.
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