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

• r

2. (noun) German physicist who discovered x-rays and developed roentgenography (1845-1923)

• rontgen
• wilhelm konrad roentgen
• wilhelm konrad rontgen

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

• radioactivity unit