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9 dictionary results for: X-ray
Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
x-ray       [eks-rey] Pronunciation Key
–noun Also, x ray, X ray.
1.Physics.
a.Often, x-rays. a form of electromagnetic radiation, similar to light but of shorter wavelength and capable of penetrating solids and of ionizing gases.
b.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 pertaining to x-rays.
Also, X-ray.

[Origin: 1895–1900; trans. of G X-Strahl (1895), the name orig. given to the rays by Röntgen, their discoverer, x signifying their unknown nature]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
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American Heritage Dictionary - Cite This Source - Share This
x-ray also X-ray   (ěks'rā')
n.   also x ray or X ray
    1. A relatively high-energy photon having a wavelength in the approximate range from 0.01 to 10 nanometers.
    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.
  2. A photograph taken with x-rays.

tr.v.   x-rayed also X-rayed, x-ray·ing also X-ray·ing, x-rays also X-rays
  1. To irradiate with x-rays.
  2. To photograph with x-rays.


[From the fact that it was a previously unknown form of radiation when first discovered.]

(Download Now or Buy the Book)
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Online Etymology Dictionary - Cite This Source - Share This
X-ray 
1896, translation of Ger. X-strahl, from X, algebraic symbol for an unknown quantity, + Strahl (pl. Strahlen) "beam, ray." Coined 1895 by Ger. scientist Wilhelm Conrad Röntgen (1845-1923), who discovered them.

Online Etymology Dictionary, © 2001 Douglas Harper
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WordNet - Cite This Source - Share This
x-ray

noun
1. electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target [syn: X ray] 
2. a radiogram made by exposing photographic film to X rays; used in medical diagnosis [syn: roentgenogram] 

verb
1. examine by taking x-rays 
2. take an x-ray of something or somebody; "The doctor x-rayed my chest" 

WordNet® 3.0, © 2006 by Princeton University.
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The American Heritage Science Dictionary - Cite This Source - Share This
x-ray also X-ray       (ěks'rā')  Pronunciation Key 
  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 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
x-ray

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.

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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American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
x-ray

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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American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

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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U.S. Gazetteer - Cite This Source - Share This

Ray City, GA (city, FIPS 63728) Location: 31.07484 N, 83.19675 W
Population (1990): 603 (279 housing units)
Area: 2.1 sq km (land), 0.0 sq km (water)
Zip code(s): 31645

Ray County, MO (county, FIPS 177) Location: 39.34984 N, 93.99053 W
Population (1990): 21971 (8611 housing units)
Area: 1475.0 sq km (land), 10.6 sq km (water)

Ray, MN Zip code(s): 56669

Ray, OH Zip code(s): 45672

Ray, ND (city, FIPS 65580) Location: 48.34131 N, 103.16267 W
Population (1990): 603 (316 housing units)
Area: 2.5 sq km (land), 0.1 sq km (water)

U.S. Gazetteer, U.S. Census Bureau
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