English dictionary

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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


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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