Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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radiation sickness sickness induced by overexposure to ionizing radiation such as x-rays or gamma rays, resulting in nausea, diarrhea, bleeding, hair loss, sterility, and often death.
synchrotron radiation electromagnetic radiation that is given off by high-energy particles as they are accelerated to nearly the speed of light in a magnetic field.
x-radiation application of or exposure to x-rays, esp. as treatment for disease. [2 definitions]