ir·​ra·​di·​a·​tion | \ i-ˌrā-dē-ˈā-shən How to pronounce irradiation (audio) \

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

Examples of irradiation in a Sentence

Recent Examples on the Web Another option may be ultraviolet germicidal irradiation. William A. Haseltine, Forbes, 21 June 2022 Hackmanite changes its color from white to purple under UV irradiation and eventually reverts back to white if no UV is present. David Bressan, Forbes, 21 June 2022 Greece's average global irradiation level crosses 1,500 kWh/m2. Rhett Power, Forbes, 5 May 2022 The agency said Leukine was found to increase survival when administered up to 48 hours after total body irradiation at doses expected to be potentially life threatening within the first few weeks after exposure. Parija Kavilanz, CNN, 29 Mar. 2022 Broadly defined, in the context of cannabis and food production, irradiation is the use of ionizing radiation to eliminate contaminants like bacteria and mold. Chris Roberts, Forbes, 30 Apr. 2022 First, physicians must destroy the original immune system with chemotherapy and sometimes irradiation. NBC News, 16 Feb. 2022 Options for sterilizing cannabis include irradiation or ozone gas, as used in the food industry. Robert Mccoppin,, 1 Jan. 2022 At issue is the commission’s medical event reporting requirements, which require that nuclear medicine providers disclose unintentional irradiation of patient skin or tissue above a radiation dose threshold of 0.5 Sieverts. Daniel Fass, STAT, 30 Dec. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'irradiation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of irradiation

1901, in the meaning defined at sense 1

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Time Traveler for irradiation

Time Traveler

The first known use of irradiation was in 1901

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Dictionary Entries Near irradiation



irradiation sickness

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Statistics for irradiation

Last Updated

7 Jul 2022

Cite this Entry

“Irradiation.” Dictionary, Merriam-Webster, Accessed 19 Aug. 2022.

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More Definitions for irradiation


ir·​ra·​di·​a·​tion | \ i-ˌrā-dē-ˈā-shən How to pronounce irradiation (audio) \

Kids Definition of irradiation

: exposure to radiation


ir·​ra·​di·​a·​tion | \ ir-ˌād-ē-ˈā-shən How to pronounce irradiation (audio) \

Medical Definition of irradiation

1a : the radiation of a physiologically active agent from a point of origin within the body especially : the spread of a nerve impulse beyond the usual conduction path
b : apparent enlargement of a light or bright object or surface when displayed against a dark background
2a : exposure to radiation (as X-rays or alpha particles)
b : application of radiation (as X-rays or gamma rays) for therapeutic purposes or for sterilization (as of food)


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