Roentgen

[ rent-guhn, -juhn, ruhnt-; German rœnt-guhn ]

noun

1. Wil·helm Kon·rad [wil, -helm , kon, -rad, vil, -helm , kawn, -, r, aht], 1845–1923, German physicist: discoverer of x-rays 1895; Nobel Prize 1901.
2. (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. : r, R

adjective

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

roentgen

¹

/ ˈrɒntɡən; -tjən; ˈrɛnt- /

noun

1. a unit of dose of electromagnetic radiation equal to the dose that will produce in air a charge of 0.258 × 10 ^–3coulomb 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 Rr

Roentgen

²

/ -tjən; ˈrœntɡən; ˈrɒntɡən; ˈrɛnt- /

noun

1. RoentgenWilhelm Konrad18451923MGermanSCIENCE: physicist Wilhelm Konrad (ˈvɪlhɛlm ˈkɔnraːt). 1845–1923, German physicist, who in 1895 discovered X-rays: Nobel prize for physics 1901

Roentgen

/ 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.

Word History and Origins

Origin of Roentgen¹

C20: named after W. K. Roentgen

Example Sentences

But nothing less than the Roentgen ray would have revealed the young man, who was stealthily watching the ferocious buck.

From Project Gutenberg

Nothing could more vividly bear out this gentleman than contemplation of the possibilities of the Roentgen ray.

From Project Gutenberg

He discovered that sound-vibrations rule the universe, that they may be turned into a musical Roentgen ray.

From Project Gutenberg

I must tell you of my own experiences in connection with these X-rays, which I hear some men describe also as Roentgen rays.

From Project Gutenberg

When the flying electrons strike upon a little metal target placed in their path, they produce the well-known Roentgen rays.

From Project Gutenberg