Roentgen

[ rent-guhn, -juhn, ruhnt-; for 1 also German rœnt-guhn ]
/ 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.

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Example sentences from the Web for Roentgen

British Dictionary definitions for Roentgen (1 of 2)

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

British Dictionary definitions for Roentgen (2 of 2)

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

Medical definitions for Roentgen (1 of 2)

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.

Medical definitions for Roentgen (2 of 2)

Roentgen
[ rĕntgən, -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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for Roentgen

Roentgen
[ rĕntgən, rĕntjən ]
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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.