noun Date: 1901 exposure to radiation (as X rays or alpha particles), the application of radiation (as X rays or gamma rays) for therapeutic purposes or for sterilization (as of food)
IRRADIATION
Meaning of IRRADIATION in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012