Roentgen

American  

[rent-guhn, -juhn, ruhnt-, rœnt-guhn] / ˈrɛnt gən, -dʒən, ˈrʌnt-, ˈrœnt gən /

noun

1. Wilhelm Konrad 1845–1923, German physicist: discoverer of x-rays 1895; Nobel Prize 1901.

2. (lowercase) 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. r, R

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adjective

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

Roentgen ¹ British  

/ ˈrœntɡən, ˈrɒntɡən, ˈrɛnt-, -tjən /

noun

1. Wilhelm Konrad (ˈvɪlhɛlm ˈkɔnraːt). 1845–1923, German physicist, who in 1895 discovered X-rays: Nobel prize for physics 1901

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roentgen ² British  

/ ˈrɛnt-, -tjən, ˈrɒntɡən /

noun

1.  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

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Roentgen Scientific  

/ rĕnt′gən,rĕnt′jən /

1. 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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Etymology

Origin of roentgen

C20: named after W. K. _Roentgen

Example Sentences

Roentgen received the 1901 Nobel Prize for the discovery of x rays.

From Textbooks • Aug. 12, 2015

Is “wild-eyed, extravagant” poet Stephen Roentgen, who hangs out at the White Horse Tavern, more or less Dylan Thomas?

From Washington Post • Jun. 3, 2015

The first-ever Nobel prize in physics was awarded to Wilhelm Roentgen of Germany for his discovery of X-rays, and with this year's winners the total number of recipients has reached 194.

From BBC • Oct. 9, 2012

Germany's 2.7-ton Roentgen Satellite, or ROSAT, followed closely on UARS' heels.

From Scientific American • Dec. 22, 2011

In the year of his arrival in Cambridge, Wilhelm Roentgen discovered X rays at the University of Würzburg in Germany, and the next year Henri Becquerel discovered radioactivity.

From "A Short History of Nearly Everything" by Bill Bryson