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



BrE BrE//ˈrɜːntjən//
, BrE//ˈrɒntjən//
, BrE//ˈrɜːntɡən//
, BrE//ˈrɒntɡən//
; NAmE NAmE//ˈrentjən//
, NAmE//ˈrəntjən//
, NAmE//ˈrentdʒən//
, NAmE//ˈrəntdʒən//
(physics) (abbreviation R)
jump to other results
a unit of radiation, used to measure the quantity of X-rays or gamma rays that have reached somebody/something Word Origin1920s: named after Wilhelm Conrad Röntgen (1845–1923), German physicist, discoverer of X-rays.
See the Oxford Advanced American Dictionary entry: roentgen