roentgen

1 of 2

adjective

roent·​gen ˈrent-gən How to pronounce roentgen (audio)
ˈrənt-,
-jən,
-shən
: of or relating to X-rays
roentgen examinations

roentgen

2 of 2

noun

: the international unit of x-radiation or gamma radiation equal to the amount of radiation that produces in one cubic centimeter of dry air at 0°C and standard atmospheric pressure ionization of either sign equal to one electrostatic unit of charge

Example Sentences

Recent Examples on the Web
Noun
The roentgen is basically a unit that relates to how much air would be ionized if electrons were freed from their atoms. Rhett Allain, Wired, 25 June 2021 The units for exposure rates are commonly given in roentgen units per hour, or R/hr. Rhett Allain, Wired, 25 June 2021 My guess is that this is a type of unit conversion from some units other than roentgen. Rhett Allain, Wired, 25 June 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'roentgen.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

Etymology

Adjective

International Scientific Vocabulary, from Wilhelm Röntgen

First Known Use

Adjective

1896, in the meaning defined above

Noun

1922, in the meaning defined above

Time Traveler
The first known use of roentgen was in 1896

Dictionary Entries Near roentgen

Cite this Entry

“Roentgen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/roentgen. Accessed 20 Mar. 2023.

Kids Definition

roentgen

noun
roent·​gen
ˈrent-gən,
ˈrənt-,
-jən
: the international unit of measurement for X-rays and gamma rays that is based on their ability to produce charged particles in the air

Medical Definition

roentgen

1 of 2 adjective
roent·​gen
variants also röntgen
: of, relating to, or using X-rays : x-ray
roentgen examinations
roentgen therapy

roentgen

2 of 2 noun
variants also röntgen
: the international unit of x-radiation or gamma radiation equal to the amount of radiation that produces in one cubic centimeter of dry air at 0°C (32°F) and standard atmospheric pressure ionization of either sign equal to one electrostatic unit of charge

Biographical Definition

Roentgen

biographical name

see röntgen

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