X ray
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.

Look at other dictionaries:

  • X|ray — «EHKS RAY», noun. U.S. a code name for the letter x, used in transmitting radio messages. X ray, 1. an electromagnetic ray having an extremely short wavelength that can go through substances that ordinary light cannot penetrate; roentgen ray. X… …   Useful english dictionary

  • X ray — Ray Ray, n. [OF. rai, F. rais, fr. L. radius a beam or ray, staff, rod, spoke of a wheel. Cf. {Radius}.] 1. One of a number of lines or parts diverging from a common point or center, like the radii of a circle; as, a star of six rays. [1913… …   The Collaborative International Dictionary of English

  • X-ray — Ray Ray, n. [OF. rai, F. rais, fr. L. radius a beam or ray, staff, rod, spoke of a wheel. Cf. {Radius}.] 1. One of a number of lines or parts diverging from a common point or center, like the radii of a circle; as, a star of six rays. [1913… …   The Collaborative International Dictionary of English

  • X-ray — [eks′rā΄] n. [transl. of Ger x strahl (< x, algebraic symbol for an unknown quantity + strahl, ray): so named by ROENTGEN Wilhelm Konrad (1895), because of its unknown character] 1. a band of electromagnetic radiation with wavelengths between… …   English World dictionary

  • 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 …   The Collaborative International Dictionary of English

  • X-ray — X ray1 [ˈeks reı] n [Date: 1800 1900; Origin: Translation of German X strahl, X representing unknown ] 1.) a beam of ↑radiation that can go through solid objects and is used for photographing the inside of the body 2.) a photograph of part of… …   Dictionary of contemporary English

  • X-ray — X rays, X raying, X rayed also x ray 1) N COUNT: usu pl X rays are a type of radiation that can pass through most solid materials. X rays are used by doctors to examine the bones or organs inside your body and are also used at airports to see… …   English dictionary

  • X-ray — X ray1 [ eks ,reı ] noun count * 1. ) a type of RADIATION that is used for looking inside things, for example your body or a suitcase 2. ) a picture of the bones or organs inside someone s body taken using X rays X ray vision someone who has X… …   Usage of the words and phrases in modern English

  • X ray — X ray, X ray X ray([e^]ks r[=a] ), v. t. to examine by means of X rays; to irradiate with X rays. [PJC] …   The Collaborative International Dictionary of English

  • X-ray — X ray, X ray X ray([e^]ks r[=a] ), v. t. to examine by means of X rays; to irradiate with X rays. [PJC] …   The Collaborative International Dictionary of English

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