roentgen : Idioms & Phrases
roentgen ray
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noun electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
X ray; X-radiation; X-ray.
WordNet
wilhelm konrad roentgen
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noun German physicist who discovered x-rays and developed roentgenography (1845-1923)
Rontgen; Wilhelm Konrad Rontgen; Roentgen.