noun (n)

• a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air(noun.quantity)

  Synonym:
  r
  

  source: wordnet30
• German physicist who discovered x-rays and developed roentgenography (1845-1923)(noun.person)

  Synonym:
  rontgen, wilhelm konrad roentgen, wilhelm konrad rontgen
  

  source: wordnet30