RADIATION

Definition of RADIATION

  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
  4. (noun)the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
  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 a radioactive substance