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• Roentgen
  Roentgen

  noun

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

  noun

  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

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

See Examples For:

Roentgen roentgen

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

Blast from the Past: Wilhelm Roentgen discovered the x-ray on November 8, 1895.

From Scientific American ● Nov. 9, 2013

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

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

Within a week, Radiologist James B. Dealy Jr. beamed a total of 450 roentgen into John in two doses; given in one shot it probably would have killed him.

From Time Magazine Archive

Teller estimates that in the U.S., fallout radiation capable of causing genetic mutations averages out at 1/500 of a roentgen a year, mostly from cesium 137.

From Time Magazine Archive

Dr. Lawrence N. Smith of Boston reported to the doctors that, in 750 cases, he found that roentgen ray treatment reduced the severity of the paroxyms and shortened the course of the disease.

From Time Magazine Archive

They proposed that the allowable daily dosage for a human being should be one-hundredth of a roentgen, about a tenth of the standard applied to X-rays.

From "Big Science" by Michael Hiltzik

The needle slowly rose and steadied at one-half roentgen per hour as he thrust the probe over the rim of the depression.

From The Lani People by Bone, Jesse F. (Jesse Franklin)