Definition of "x-ray" []

  • A relatively high-energy photon having a wavelength in the approximate range from 0.01 to 10 nanometers. (noun)
  • 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. (noun)
  • A photograph taken with x-rays. (noun)
  • To irradiate with x-rays. (verb-transitive)
  • To photograph with x-rays. (verb-transitive)
  • 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 (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

  • (as modifier) (noun)
  • 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 (noun)
  • A code word for the letter x (noun)
  • To photograph (part of the body, etc) using X-rays (verb)
  • To treat or examine by means of X-rays (verb) (c) HarperCollins Publishers Ltd 2016

Use "x-ray" in a sentence
  • "Interestingly, that included a pair of scissors, a fixed knife and a camping lighter (5cm blue flame, contains gasoline), which neither the hand screening nor the x-ray inspection found."
  • "After an initial assessment, and after x-ray after x-ray, the doctors struggled to break the news."
  • "This was ruled out when an x-ray of Pandorama's other hock proved identical."