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[ih-rey-dee-ey-shuh n] /ɪˌreɪ diˈeɪ ʃən/
the act of irradiating.
the state of being irradiated.
intellectual or spiritual enlightenment.
a ray of light; beam.
Optics. the apparent enlargement of an object when seen against a dark background.
the use of x-rays or other forms of radiation for the treatment of disease, the making of x-ray photographs, the manufacture of vitamin D, etc.
exposure or the process of exposure to x-rays or other radiation.
Physics. irradiance.
Origin of irradiation
1580-90; < Late Latin irradiātiōn- (stem of irradiātiō). See ir-1, radiation
Related forms
postirradiation, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for irradiation
  • But however crude and destructive the decontamination process, it has proved effective: irradiation does indeed destroy anthrax.
  • The others mated with beetles rendered sterile by irradiation.
  • But also have in mind that electricity prices can be much higher also, so it compensates for the lower irradiation.
  • irradiation works, but raises feasibility and other concerns.
  • Ultraviolet irradiation, which is being used in combination with formalin by one vaccine manufacturer, deserves further study.
  • Meteoroids in space are constantly irradiated and that irradiation ceases when the meteoroid falls to ground.
  • irradiation is a stressor that also could increase the mutation rate, hence not as satisfactory.
  • Cancer patients were exposed to total body irradiation under the guise of treatment.
  • Agriculture needs to develop an irradiation method for sterilizing packaged and processed meats and vegetables.
  • However, the same people who are so frightened of nuclear power are preventing irradiation of food.
British Dictionary definitions for irradiation


the act or process of irradiating or the state of being irradiated
the apparent enlargement of a brightly lit object when it is viewed against a dark background
a shaft of light; beam or ray
  1. the therapeutic or diagnostic use of radiation, esp X-rays
  2. exposure of a patient to such radiation
another name for radiation, irradiance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for irradiation

1580s, from French irradiation, from Latin *irradiationem, noun of action from past participle stem of irradiare (see irradiate). Originally of light (literally and figuratively); of X-rays, etc., from 1901.

Online Etymology Dictionary, © 2010 Douglas Harper
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irradiation in Medicine

irradiation ir·ra·di·a·tion (ĭ-rā'dē-ā'shən)

  1. Exposure or subjection to the action of radiation for diagnostic or therapeutic purposes.

  2. Medical treatment by exposure to radiation.

  3. The spread of a nervous impulse beyond the usual path of conduction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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