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[v. ih-rey-dee-eyt; adj. ih-rey-dee-it, -eyt] /v. ɪˈreɪ diˌeɪt; adj. ɪˈreɪ di ɪt, -ˌeɪt/
verb (used with object), irradiated, irradiating.
to shed rays of light upon; illuminate.
to illumine intellectually or spiritually.
to brighten as if with light.
to radiate (light, illumination, etc.).
to heat with radiant energy.
to treat by exposure to radiation, as of ultraviolet light.
to expose to radiation.
verb (used without object), irradiated, irradiating.
  1. to emit rays; shine.
  2. to become radiant.
irradiated; bright.
1595-1605; < Latin irradiātus, past participle of irradiāre to shine upon. See ir-1, radiate
Related forms
irradiatingly, adverb
irradiative, adjective
irradiator, noun
nonirradiated, adjective
unirradiated, adjective
unirradiative, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for irradiated
  • Essentially, the vaccine consists of these irradiated parasites packed into a hypodermic needle.
  • Hamburgers cooked over a bed of coals are irradiated to perfection by infrared waves.
  • It is unfortunate that people are afraid of irradiated food.
  • Even iceberg lettuce or spinach can be irradiated without the leaves going limp.
  • Another way to extend the life of fresh fruits and vegetables is to buy irradiated produce.
  • The red light, along with a fainter blue, emanates from hydrogen gas irradiated by nearby stars.
  • It was discovered that letting the irradiated plastic interact with oxygen created free radicals, weakening the implant.
  • For instance, worrisome evidence suggests that radiation may promote lung cancer in the irradiated side of the body.
  • Finally they transplanted the hybrid bone marrow back into the irradiated mouse.
  • Meteoroids in space are constantly irradiated and that irradiation ceases when the meteoroid falls to ground.
British Dictionary definitions for irradiated


(transitive) (physics) to subject to or treat with light or other electromagnetic radiation or with beams of particles
(transitive) to expose (food) to electromagnetic radiation to kill bacteria and retard deterioration
(transitive) to make clear or bright intellectually or spiritually; illumine
a less common word for radiate (sense 1)
(intransitive) (obsolete) to become radiant
Derived Forms
irradiative, adjective
irradiator, noun
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 irradiated



c.1600, "to cast beams of light upon," from Latin irradiatus, past participle of irradiare "shine forth," from assimilated form of in- "into, in" (see in- (2)) + radiare "to shine" (see radiate). Meaning "expose to radiation other than light" (originally X-rays) is from 1901. Related: Irradiated; irradiating.

Online Etymology Dictionary, © 2010 Douglas Harper
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irradiated in Medicine

irradiate ir·ra·di·ate (ĭ-rā'dē-āt')
v. ir·ra·di·at·ed, ir·ra·di·at·ing, ir·ra·di·ates

  1. To expose to radiation, as for diagnostic or therapeutic purposes.

  2. To treat with radiation.

  3. To apply radiation to a structure or organism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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irradiated in Science
To expose to or treat with radiation. For example, meat sold as food is often irradiated with x-rays or other radiation to kill bacteria; uranium 238 can be irradiated with neutrons to create fissionable plutonium 239.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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