[ ih-rey-dee-ey-shuh n ]
/ ɪˌreɪ diˈeɪ ʃən /



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Origin of irradiation

First recorded in 1580–90, irradiation is from the Late Latin word irradiātiōn- (stem of irradiātiō). See ir-1, radiation

OTHER WORDS FROM irradiation

post·ir·ra·di·a·tion, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for irradiation

British Dictionary definitions for irradiation

/ (ɪˌreɪdɪˈeɪʃən) /


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

Medical definitions for irradiation

[ ĭ-rā′dē-āshən ]


Exposure or subjection to the action of radiation for diagnostic or therapeutic purposes.
Medical treatment by exposure to radiation.
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.