noun Also x ray, X ray.
- Often x-rays.a form of electromagnetic radiation, similar to light but of shorter wavelength and capable of penetrating solids and of ionizing gases.
- such radiation having wavelengths in the range of approximately 0.1–10 nm.
a radiograph made by x-rays.
(initial capital letter) a word in communications to represent the letter X.
verb (used with object)
to examine, photograph, or treat with x-rays.
of or relating to x-rays.
Origin of x-ray
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 Unabridged Dictionary, © Random House, Inc. 2019
Related Words for xraypicture, photograph, replication, photocopy, recreation, propagation, replica, facsimile, imitation, print, breeding, copy, radioactivity, shoot, illustrate, reproduce, capture, dissect, resolve, determine
- 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
- (as modifier)X-ray astronomy
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
(usually capital) communications a code word for the letter x
to photograph (part of the body, etc) using X-rays
to treat or examine by means of X-rays
Word Origin for X-ray
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
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
A relatively high-energy photon with wavelength in the approximate range from 0.01 to 10 nanometers.roentgen ray
A stream of such photons used for their penetrating power in radiography, radiology, radiotherapy, and scientific research. Often used in the plural.roentgen ray
A photograph taken with x-rays.
To irradiate with x-rays.
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.
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.
An image of an internal structure, such as a body part, taken with x-rays.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Because x-rays can travel through solid material and affect photographic plates, they are widely used in diagnosing medical problems.
Objects in the sky also send out x-rays in processes that use very high energy.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.