sickness produced by overexposure to radiation, as from X-rays or atomic explosions, and characterized by nausea, diarrhea, bleeding, loss of hair, and increased susceptibility to infection
See radiation sickness in American Heritage Dictionary 4
noun
Illness induced by exposure to ionizing radiation, ranging in severity from nausea, vomiting, headache, and diarrhea to loss of hair and teeth, reduction in red and white blood cell counts, extensive hemorrhaging, sterility, and death.