Roentgen

[ rent-guh n, -juh n, ruhnt-; for 1 also German rœnt-guh n ]

/ ˈrɛnt gən, -dʒən, ˈrʌnt-; for 1 also German ˈrœnt gən /

noun

Wil·helm Kon·rad

[wil-helm kon-rad; German vil-helm kawn-raht] /ˈwɪl hɛlm ˈkɒn ræd; German ˈvɪl hɛlm ˈkɔn rɑt/, 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 relating to Wilhelm Roentgen, the Roentgen unit, or especially to x-rays.

Also Röntgen.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for roentgen

Is it credible that old Melchizedek knew nothing about the telephone, or the Roentgen ray, or the cholera bacillus?
A Century of Science and Other Essays|John Fiske
At one time it was psychic force, then Roentgen or X-rays; lately it has been attributed to the mysterious effects of radium!
The Seven Follies of Science [2nd ed.]|John Phin
Even the Roentgen ray apparatus has quickly won its way, and psychotherapy is less expensive.
Psychotherapy|Hugo Mnsterberg
Luckily, not even Roentgen rays could discover what a store of drawings, charts, and fortress plans I keep in my memory.
The Coming Conquest of England|August Niemann

"That light wasn't exactly the Roentgen variety," Drake interrupted my absorption in our surroundings.
The Metal Monster|A. Merritt

British Dictionary definitions for roentgen

roentgen

rntgen

/ (ˈrɒntɡən, -tjən, ˈrɛnt-) /

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 completelySymbol: R, r

Word Origin for roentgen

C20: named after W. K. Roentgen

Roentgen

Rntgen

/ (ˈrɒntɡən, -tjən, ˈrɛnt-, German ˈrœntɡən) /

noun

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

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for roentgen

roentgen

1896, in Roentgen rays "X-rays," in recognition of German 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 French in 1921.

Medicine definitions for roentgen

roentgen

n.

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

[ rĕnt′gən, -jən, rŭnt′- ]

Wilhelm Konrad 1845-1923

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

Science definitions for roentgen

Roentgen

[ rĕnt′gən, rĕnt′jən ]

Wilhelm Konrad 1845-1923

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.