• noun:   the act of spreading outward from a central source
• noun:   a radial arrangement of nerve fibers connecting different parts of the brain
• noun:   the spread of a group of organisms into new habitats
• noun:   energy that is radiated or transmitted in the form of rays or waves or particles
• noun:   the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
• noun:   (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
• noun:   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

  Example: "He was suffering from radiation"

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