Definition of roentgen in English:


(also röntgen, R)

Pronunciation /ˈrəːntɡən/ /ˈrʌntdʒən/ /ˈrɒntɡən/


  • A unit of ionizing radiation, the amount producing one electrostatic unit of positive or negative ionic charge in one cubic centimetre of air under standard conditions.

    • ‘She talked about rems and rads and roentgens per hour, and at first, he tried to memorize her words, but he wasn't able to commit the information to memory.’
    • ‘A lethal exposure of radiation ranges from 300 to 500 roentgens an hour; levels in the tour areas vary from 15 to several hundred microroentgens an hour.’
    • ‘Some paramecium can withstand 200,000 roentgens.’
    • ‘This is also equivalent to exposure to a level of one roentgen.’


1920s named after Wilhelm Conrad Röntgen (1845–1923), German physicist, discoverer of X-rays.



/ˈrəːntɡən/ /ˈrʌntdʒən/ /ˈrɒntɡən/