radiation
noun /ˌreɪdiˈeɪʃn/
  /ˌreɪdiˈeɪʃn/
- [uncountable, countable] powerful and very dangerous rays that are sent out from radioactive substances- high levels/doses of radiation that damage cells
- the link between exposure to radiation and childhood cancer
- a radiation leak from a nuclear power station
- radiation sickness
- the radiations emitted by radium
 Extra ExamplesTopics Physics and chemistryb2- Nuclear testing has exposed millions of people to radiation.
- The counter showed high levels of radiation.
 Oxford Collocations Dictionaryadjective- background
- low-level
- damaging
- …
 - dose
 - emit
- give off
- absorb
- …
 - leak
- leak out
 - sickness
- dose
- level
- …
 - radiation from
 - levels of radiation
 
- [uncountable] heat, energy, etc. that is sent out in the form of rays- ultraviolet radiation
- electromagnetic radiation from power lines
- The ozone layer absorbs solar radiation.
 Oxford Collocations Dictionaryadjective- background
- low-level
- damaging
- …
 - dose
 - emit
- give off
- absorb
- …
 - leak
- leak out
 - sickness
- dose
- level
- …
 - radiation from
 - levels of radiation
 
- (also radiation therapy)[uncountable] the treatment of cancer and other diseases using radiation compare chemotherapy, radiotherapyOxford Collocations Dictionaryadjective- background
- low-level
- damaging
- …
 - dose
 - emit
- give off
- absorb
- …
 - leak
- leak out
 - sickness
- dose
- level
- …
 - radiation from
 - levels of radiation
 
Word Originlate Middle English (denoting the action of sending out rays of light): from Latin radiatio(n-), from radiare ‘emit rays’, from radius ‘ray, spoke’.