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(noun) actinotherapy, radiation therapy, radiotherapy, irradiation
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
(noun) radioactivity
the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
(noun) radiation sickness, radiation syndrome
syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours
he was suffering from radiation