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English noun: radiation

1. radiation (phenomenon) energy that is radiated or transmitted in the form of rays or waves or particles


Broader (hypernym)energy, free energy


Narrower (hyponym)cosmic radiation, electromagnetic radiation, electromagnetic wave, ionizing radiation, nonparticulate radiation, solar radiation

2. radiation (act) the act of spreading outward from a central source


Broader (hypernym)emanation, emission


Narrower (hyponym)bombardment

3. radiation (state) 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


SamplesHe was suffering from radiation.


Synonymsradiation sickness, radiation syndrome


Broader (hypernym)syndrome

4. radiation (process) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay


Synonymsradioactivity


Broader (hypernym)emission


Narrower (hyponym)corpuscular radiation, particulate radiation

5. radiation (event) the spread of a group of organisms into new habitats


Broader (hypernym)action, activity, natural action, natural process, spread, spreading


Narrower (hyponym)adaptive radiation

6. radiation (body) a radial arrangement of nerve fibers connecting different parts of the brain


Broader (hypernym)neural structure

7. radiation (act) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance


Synonymsactinotherapy, irradiation, radiation therapy, radiotherapy


Broader (hypernym)therapy


Narrower (hyponym)Curietherapy, phototherapy, radium therapy, X-ray therapy


Domain categorymedical specialty, medicine









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