Definitions for: Radiation


[n] (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
[n] the act of spreading outward from a central source
[n] a radial arrangement of nerve fibers connecting different parts of the brain
[n] the spread of a group of organisms into new habitats
[n] energy that is radiated or transmitted in the form of rays or waves or particles
[n] the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
[n] 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"



Webster (1913) Definition: Ra`di*a"tion, n. [L. radiatio: cf. F. radiation.]
1. The act of radiating, or the state of being radiated;
emission and diffusion of rays of light; beamy brightness.

2. The shooting forth of anything from a point or surface,
like the diverging rays of light; as, the radiation of
heat.

Synonyms: actinotherapy, irradiation, radiation sickness, radiation syndrome, radiation therapy, radioactivity, radiotherapy

See Also: action, activity, adaptive radiation, bombardment, corpuscular radiation, Curietherapy, electromagnetic radiation, electromagnetic wave, emanation, emission, emission, energy, ionizing radiation, natural action, natural process, neural structure, nonparticulate radiation, particulate radiation, phototherapy, radium therapy, solar radiation, spread, spreading, syndrome, therapy, X-ray therapy

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