radiotherapy
US /ˌreɪ.di.oʊˈθer.ə.pi/
UK /ˌreɪ.di.oʊˈθer.ə.pi/
1.
the treatment of disease, especially cancer, using X-rays or other forms of radiation.
:
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She is undergoing radiotherapy for her lung cancer.
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Advances in radiotherapy have improved cancer survival rates.