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[rey-dee-oh-ther-uh-pee] /ˌreɪ di oʊˈθɛr ə pi/
noun, Medicine/Medical.
treatment of disease by means of x-rays or of radioactive substances.
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 radiation Compare chemotherapy

1903, from radio- + therapy.

radiation therapy n.

radiotherapy ra·di·o·ther·a·py (rā’dē-ō-thěr’ə-pē)
Treatment of disease with radiation, especially by selective irradiation with x-rays or other ionizing radiation and by ingestion of radioisotopes.
ra’di·o·ther’a·pist n.


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