Roentgen
— Noun
– English
～ German physicist who discovered x-rays and developed roentgenography (1845-1923)
roentgen ray
— Noun
– English
～ electromagnetic radiation of short wavelength produced when high-speed electrons strike a solid target
roentgen
— Noun
– English
～ a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
roentgenium
— Noun
– English
～ a radioactive transuranic element