Open English Wordnet
Nouns
(n)radiation sickness, radiation syndrome, radiationsyndrome 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”
(n)radiation, radioactivitythe spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
(n)radiotherapy, radiation therapy, radiation, actinotherapy, irradiation(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance