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radiation

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radiation/ˌreɪdiˈeɪʃən/noun
radiation
/ˌreɪdiˈeɪʃən/
noun
Learner's definition of RADIATION  
[noncount]
: a type of dangerous and powerful energy that is produced by radioactive substances and nuclear reactions
medical  : the use of controlled amounts of radiation for the treatment of diseases (such as cancer)
— called also radiation therapyradiotherapy
: energy that comes from a source in the form of waves or rays you cannot see
   b  technical  : the process of giving off energy in the form of waves or rays you cannot see
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