Roentgen ray
Rontgen ray R["o]ntgen ray, Roentgen ray Roentgen ray [see {R["o]ntgen}.] (Physics) An {X-ray}; originally, the term was applied to any of the rays produced when cathode rays strike upon surface of a solid (as the wall of the vacuum tube), but now it refers specifically to electromagnetic radiation having wavelengths from 10^{-3} nm to 10 nm, immediately below ultraviolet radiation on the wavelength scale. R["o]ntgen rays are noted for their penetration of 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. They are one of the forms of ionizing radiation, which can have damaging effects on living cells. They also ionize gases, but cannot be reflected, or polarized, or deflected by a magnetic field. They are used in examining opaque objects, especially in medicine for visualizing organs and other objects inside the human body, as for locating fractures or bullets, and examining internal organs for abnormalities. [Webster 1913 Suppl. +PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Roentgen ray — the Anglicised spelling of {R[ o]ntgen ray}. Same as {X ray}. [PJC] …   The Collaborative International Dictionary of English

  • roentgen ray — n X RAY (1) …   Medical dictionary

  • Roentgen ray — n. [also r r ] X RAY …   English World dictionary

  • roentgen ray — noun electromagnetic radiation of short wavelength produced when high speed electrons strike a solid target • Syn: ↑X ray, ↑X ray, ↑X radiation • Hypernyms: ↑electromagnetic radiation, ↑electromagnetic wave, ↑nonparticulate radiation, ↑ …   Useful english dictionary

  • roentgen ray — /ˈrɜntgən reɪ/ (say rerntguhn ray) noun → X ray (def. 1) …   Australian English dictionary

  • roentgen ray — noun Usage: often capitalized 1st R Date: circa 1890 x ray …   New Collegiate Dictionary

  • Roentgen ray — (sometimes l.c.) x ray. [1895 1900] * * * …   Universalium

  • Roentgen ray — See X ray …   Ballentine's law dictionary

  • roentgen-ray computed tomography — rentgeno kompiuterinė tomografija statusas T sritis Standartizacija ir metrologija apibrėžtis Tomografija, kai įvairiomis kryptimis rentgeno spinduliuote peršviesto tiriamo organo vaizdai apdorojami naudojant rekonstrukcinės tomografijos… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • roentgen ray dermatitis — x ray d …   Medical dictionary

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