noun Medicine/Medical.
- treatment of disease by means of x-rays or of radioactive substances.
noun
- the treatment of disease, esp cancer, by means of alpha or beta particles emitted from an implanted or ingested radioisotope, or by means of a beam of high-energy radiationCompare chemotherapy
n.
- Treatment of disease with radiation, especially by selective irradiation with x-rays or other ionizing radiation and by ingestion of radioisotopes.