"roentgen" in the noun sense
1. roentgen, R
a unit of radiation exposure the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
2. Roentgen, Wilhelm Konrad Roentgen, Rontgen, Wilhelm Konrad Rontgen
German physicist who discovered x-rays and developed roentgenography (1845-1923)
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