Definition of irradiation
1
: exposure to radiation (such as X-rays or alpha particles)
2
: the application of radiation (such as X-rays or gamma rays) for therapeutic purposes or for sterilization (as of food)
also
: partial or complete sterilization by irradiation
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Merriam-Webster unabridged
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Time Traveler for irradiation
The first known use of irradiation was in 1901
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