w roentgen

Roentgen

[rent-guhn, -juhn, ruhnt-; for 1 also German rœnt-guhn]
noun
1.
Wilhelm Konrad [wil-helm kon-rad; German vil-helm kawn-raht] , 1845–1923, German physicist: discoverer of x-rays 1895; Nobel prize 1901.
2.
(lowercase) Physics. a unit of exposure dose that measures x-rays or gamma rays in terms of the ions or electrons produced in dry air at 0° C and one atmosphere, equal to the amount of radiation producing one electrostatic unit of positive or negative charge per cubic centimeter of air. Abbreviation: r, R
adjective
3.
(sometimes lowercase) of or pertaining to Wilhelm Roentgen, the Roentgen unit, or especially to x-rays.
Also, Röntgen.
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World English Dictionary
roentgen or röntgen (ˈrɒntɡən, -tjən, ˈrɛnt-, ˈrɒntɡən, -tjən, ˈrɛnt-)
 
n
R, r a unit of dose of electromagnetic radiation equal to the dose that will produce in air a charge of 0.258 × 10--3 coulomb on all ions of one sign, when all the electrons of both signs liberated in a volume of air of mass one kilogram are stopped completely
 
[C20: named after W. K. Roentgen]
 
röntgen or röntgen
 
n
 
[C20: named after W. K. Roentgen]

Roentgen or Röntgen (ˈrɒntɡən, -tjən, ˈrɛnt-, German ˈrœntɡən, ˈrɒntɡən, -tjən, ˈrɛnt-, German ˈrœntɡən)
 
n
Wilhelm Konrad (ˈvɪlhɛlm ˈkɔnraːt). 1845--1923, German physicist, who in 1895 discovered X-rays: Nobel prize for physics 1901
 
Röntgen or Röntgen
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

roentgen
1896, in Roentgen rays "X-rays," in allusion to Ger. physicist Wilhem Conrad Röntgen (1845-1923), who discovered X-rays in 1895. As a unit of exposure to radiation, it is attested from 1922, proposed in Fr. in 1921.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

roentgen roent·gen or rönt·gen (rěnt'gən, -jən, rŭnt'-)
n.
Abbr. R, r
A unit of radiation exposure that is equal to the quantity of ionizing radiation that will produce one electrostatic unit of electricity in one cubic centimeter of dry air at 0°C and standard atmospheric pressure.

Roentgen Roent·gen (rěnt'gən, -jən, rŭnt'-) or Rönt·gen (rɶnt'gən), Wilhelm Konrad. 1845-1923.

German physicist who discovered x-rays and developed x-ray photography, revolutionizing medical diagnosis. He won a 1901 Nobel Prize.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
Roentgen   (rěnt'gən, rěnt'jən)  Pronunciation Key 
German physicist who discovered x-rays in 1895 and went on to develop x-ray photography, which revolutionized medical diagnosis. In 1901 he was awarded the Nobel Prize for physics.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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