radiation
2 ENTRIES FOUND:
Britannica Dictionary definition of RADIATION
[noncount]
1
:
a type of dangerous and powerful energy that is produced by radioactive substances and nuclear reactions
-
She was exposed to high levels of radiation.
2
medical
:
the use of controlled amounts of radiation for the treatment of diseases (such as cancer)
-
He goes in for radiation next week.
— called also
radiation therapy,
radiotherapy
3
a
:
energy that comes from a source in the form of waves or rays you cannot see
-
ultraviolet radiation
b
technical
:
the process of giving off energy in the form of waves or rays you cannot see
-
the sun's radiation of heat
