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x-ray

[eks-rey] /ˈɛksˌreɪ/
noun, Also, x ray, X ray
1.
Physics.
  1. Often, x-rays. a form of electromagnetic radiation, similar to light but of shorter wavelength and capable of penetrating solids and of ionizing gases.
  2. such radiation having wavelengths in the range of approximately 0.1–10 nm.
2.
a radiograph made by x-rays.
3.
(initial capital letter) a word in communications to represent the letter X.
verb (used with object)
4.
to examine, photograph, or treat with x-rays.
adjective
5.
of or relating to x-rays.
Also, X-ray.
Origin
1895-1900
1895-1900; translation of German X-Strahl (1895), the name orig. given to the rays by Röntgen, their discoverer, x signifying their unknown nature
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for xray
  • It is sometimes a side effect of chemotherapy or xray treatments for cancer.
  • It is used in cold traps for certain laboratory equipment and to cool xray detectors.
  • xray, then later ct, mri, and ultrasound along with endoscopy extended the range.
  • Electron capture results in the spontaneous emission of an xray.
  • In patients with a normal chest xray, tuberculosis is a rare finding.
  • Lunar transits have been used to map xray emissions from the nebula.
British Dictionary definitions for xray

X-ray

noun
1.
  1. electromagnetic radiation emitted when matter is bombarded with fast electrons. X-rays have wavelengths shorter than that of ultraviolet radiation, that is less than about 1 × 10–8 metres. They extend to indefinitely short wavelengths, but below about 1 × 10–11 metres they are often called gamma radiation
  2. (as modifier): X-ray astronomy
2.
a picture produced by exposing photographic film to X-rays: used in medicine as a diagnostic aid as parts of the body, such as bones, absorb X-rays and so appear as opaque areas on the picture
3.
(usually capital) (communications) a code word for the letter x
verb (transitive)
4.
to photograph (part of the body, etc) using X-rays
5.
to treat or examine by means of X-rays
Word Origin
C19: partial translation of German X-Strahlen (from Strahl ray), coined by W. K. Roentgen in 1895
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for xray

X-ray

n.

1896, translation of German X-strahl, from X, algebraic symbol for an unknown quantity, + Strahl (plural Strahlen) "beam, ray." Coined 1895 by German scientist Wilhelm Conrad Röntgen (1845-1923), who discovered them.

Online Etymology Dictionary, © 2010 Douglas Harper
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xray in Medicine

x-ray or X-ray
n. or x ray or X ray

  1. A relatively high-energy photon with wavelength in the approximate range from 0.01 to 10 nanometers. Also called roentgen ray.

  2. A stream of such photons used for their penetrating power in radiography, radiology, radiotherapy, and scientific research. Often used in the plural. Also called roentgen ray.

  3. A photograph taken with x-rays.

v. x-rayed or X-rayed, x-ray·ing or X-ray·ing, x-rays or X-rays
  1. To irradiate with x-rays.

  2. To photograph with x-rays.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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xray in Science
x-ray also X-ray
  (ěks'rā')   
  1. A high-energy stream of electromagnetic radiation having a frequency higher than that of ultraviolet light but less than that of a gamma ray (in the range of approximately 1016 to 1019 hertz). X-rays are absorbed by many forms of matter, including body tissues, and are used in medicine and industry to produce images of internal structures. See more at electromagnetic spectrum.

  2. An image of an internal structure, such as a body part, taken with x-rays.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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xray in Culture

x-ray definition


A form of electromagnetic radiation with very high frequency and energy. X-rays lie between ultraviolet radiation and gamma radiation on the electromagnetic spectrum.

Note: Because x-rays can travel through solid material and affect photographic plates, they are widely used in diagnosing medical problems.
Note: Objects in the sky also send out x-rays in processes that use very high energy.

x-ray definition


A photograph or image obtained through the use of x-rays. An x-ray is taken when an image of internal body structures (such as bones or organs) is needed to diagnose disease or determine the extent of injuries.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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