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X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV. They are shorter in wavelength than UV rays and longer than gamma rays. In many languages, X-radiation is called Röntgen radiation, after Wilhelm Röntgen, who is usually credited as its discoverer, and who had named it X-radiation to signify an unknown type of radiation. Correct spelling of X-ray(s) in the English language includes the variants x-ray(s) and X ray(s). XRAY is used as the phonetic pronunciation for the letter x.
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|WordNet 2.0 Dictionary||Download this dictionary|
1. electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
(synonym) X ray, roentgen ray
(hypernym) electromagnetic radiation, electromagnetic wave, nonparticulate radiation
2. obtaining images by the use of X rays
(hypernym) imaging, tomography
(hyponym) computerized tomography, computed tomography, CT, computerized axial tomography, computed axial tomography, CAT
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