Roentgen rays
X ray X ray, X-ray X-ray([e^]ks"r[=a]`), n. [so called by its discoverer because of its enigmatical character, x being an algebraic symbol for an unknown quantity.] (Physics) originally, any of the rays produced when cathode rays strike upon surface of a solid (as a copper target or the wall of the vacuum tube); now defined as electromagnetic radiation with a wavelength of 0.1 to 10 nanometers. X-rays are noted for their penetration of many opaque substances, as wood and flesh, their action on photographic plates, and their fluorescent effects. They were called {X rays} by their discoverer, W. K. R["o]ntgen, but were also referred to for some time as {Roentgen rays}. The term X-ray has become the most common designation. They also ionize gases, but cannot be reflected, or polarized, or deflected by a magnetic field. They are used in examining objects opaque to visible light, as for imaging bones or other structures inside the human body, and for detecting flaws in metal objects, such as in welds. [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English. 2000.

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  • Roentgen rays — rentgeno spinduliuotė statusas T sritis Standartizacija ir metrologija apibrėžtis Elektromagnetinė jonizuojančioji spinduliuotė, kurios bangos ilgis nuo 10⁻¹⁴ m iki 10⁻⁷ m. atitikmenys: angl. Roentgen rays; X ray radiation; X rays vok.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Roentgen rays — rentgeno spinduliuotė statusas T sritis Standartizacija ir metrologija apibrėžtis Fotoninė spinduliuotė, sudaryta iš stabdomosios ir (arba) būdingosios spinduliuotės. atitikmenys: angl. Roentgen rays; X ray radiation; X rays vok. Röntgenstrahlung …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Roentgen Rays —    Wilhelm Konrad von Roentgen (1845 1923), professor of physics at the University of Wurzburg, Germany, was working late on the night of November 3, 1893, after all his assistants had left the laboratory. He noticed that a fluorescent surface… …   Dictionary of eponyms

  • roentgen rays — roent·gen rays (rentґgen) [W.K. Rцntgen] x rays; see under ray …   Medical dictionary

  • Roentgen rays — X rays …   English contemporary dictionary

  • roentgen rays — plural noun dated X rays …   English new terms dictionary

  • roentgen rays — x r s …   Medical dictionary

  • roentgen rays — …   Useful english dictionary

  • infra roentgen rays — grenz r s …   Medical dictionary

  • roentgen — 1896, in Roentgen rays X rays, in recognition of German physicist Wilhem Conrad Röntgen (1845 1923), who discovered X rays in 1895. As a unit of exposure to radiation, it is attested from 1922, proposed in French in 1921 …   Etymology dictionary

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