radiotherapy

n. treatment through the use of radiation

Radiation therapy (or radiotherapy) is the medical use of ionizing radiation as part of cancer treatment to control malignant cells (not to be confused with radiology, the use of radiation in medical imaging and diagnosis). Radiotherapy may be used for curative or adjuvant cancer treatment. It is used as palliative treatment (where cure is not possible and the aim is for local disease control or symptomatic relief) or as therapeutic treatment (where the therapy has survival benefit but is not curative).  Total body irradiation (TBI) is a radiotherapy technique used to prepare the body to receive a bone marrow transplant. Radiotherapy has a few applications in non-malignant conditions, such as the treatment of  trigeminal neuralgia, severe thyroid eye disease,  pterygium, prevention of keloid scar growth, and prevention of heterotopic ossification. The use of radiotherapy in non-malignant conditions is limited partly by worries about the risk of radiation-induced cancers.
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Radiotherapy /ra·dio·ther·a·py/ treatment of disease by means of ionizing radiation; tissue may be exposed to a beam of radiation, or a radioactive [more]Radiotherapy - Community and Resources

Noun
1. (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
(synonym) radiation therapy, radiation, actinotherapy, irradiation
(hypernym) therapy
(hyponym) phototherapy
(classification) medicine, medical specialty

The treatment of disease with ionizing radiation. Synonymous with radiation therapy.