wilhelm k roentgen

noun

Wil·helm Kon·rad

[wil-helm kon-rad; German vil-helm kawn-raht] , 1845–1923, German physicist: discoverer of x-rays 1895; Nobel prize 1901.

( 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

( sometimes lowercase ) of or pertaining to Wilhelm Roentgen, the Roentgen unit, or especially to x-rays.

Also, Röntgen.

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To wilhelm k roentgen

Collins

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]

00:10

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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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.

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.

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