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 therapy, radiotherapy
: energy that comes from a source in the form of waves or rays you cannot see
technical : the process of giving off energy in the form of waves or rays you cannot see
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