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  1. [noun] energy that is radiated or transmitted in the form of rays or waves or particles

  2. [noun] the act of spreading outward from a central source

  3. [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; "he was suffering from radiation"
    Synonyms: sickness, syndrome

  4. [noun] the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
    Synonyms: radioactivity

  5. [noun] the spread of a group of organisms into new habitats

  6. [noun] a radial arrangement of nerve fibers connecting different parts of the brain

  7. [noun] (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
    Synonyms: radiotherapy, therapy, actinotherapy, ir


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