Definition of roentgen noun from the Oxford Advanced Learner's Dictionary

 

roentgen

 noun
noun
BrE BrE//ˈrɜːntjən//
 
, BrE//ˈrɒntjən//
 
, BrE//ˈrɜːntɡən//
 
, BrE//ˈrɒntɡən//
 
; NAmE NAmE//ˈrentjən//
 
, NAmE//ˈrəntjən//
 
, NAmE//ˈrentdʒən//
 
, NAmE//ˈrəntdʒən//
 
(physics)(abbreviation R)
 
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a unit of radiation, used to measure the quantity of X-rays or gamma rays that have reached somebody/something Word Origin 1920s: named after Wilhelm Conrad Röntgen (1845–1923), German physicist, discoverer of X-rays.
See the Oxford Advanced American Dictionary entry: roentgen