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Meaning of RADIATION

Pronunciation:  `reydee'eyshun

WordNet Dictionary
  1. [n]  (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
  2. [n]  the act of spreading outward from a central source
  3. [n]  a radial arrangement of nerve fibers connecting different parts of the brain
  4. [n]  the spread of a group of organisms into new habitats
  5. [n]  energy that is radiated or transmitted in the form of rays or waves or particles
  6. [n]  the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
  7. [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"

RADIATION is a 9 letter word that starts with R.


 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



Webster's 1913 Dictionary
\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

Medical Dictionary
 Definition: use of high-energy radiation from x-rays, neutrons, and other sources to kill cancer cells and shrink tumors.
Biology Dictionary
  1. In evolution, the process through which a group of species diverge from a single ancestral form.
  2. General term referring to the emission of electromagnetic waves (e.g. heat, light. etc.) or particles (e.g. neutrons) from from a material.