Noun roentgen has 2 senses
  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
    --1 is a kind of radioactivity unit
  2. Roentgen, Wilhelm Konrad Roentgen, Rontgen, Wilhelm Konrad Rontgen - German physicist who discovered x-rays and developed roentgenography (1845-1923)
    --2 is a kind of physicist
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