Source : WordNet®

roentgen
     n 1: a unit of radiation exposure; the dose of ionizing radiation
          that will produce 1 electrostatic unit of electricity in
          1 cc of dry air [syn: {R}]
     2: German physicist who discovered x-rays and developed
        roentgenography (1845-1923) [syn: {Wilhelm Konrad Roentgen},
         {Rontgen}, {Wilhelm Konrad Rontgen}]