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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.

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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  • Radiothon

    [rey-dee-oh-thon] /ˈreɪ di oʊˌθɒn/ noun 1. an on-the-air radio campaign, often lasting 24 hours or more, designed to raise money for a radio station, charity, the arts, etc., as from listeners phoning in and pledging specific donations, sometimes in exchange for gifts or premiums.

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    [rey-dee-oh-thawr-ee-uh m, -thohr-] /ˌreɪ di oʊˈθɔr i əm, -ˈθoʊr-/ noun, Chemistry. 1. a disintegration product of .

  • Radiotoxemia

    radiotoxemia ra·di·o·tox·e·mi·a (rā’dē-ō-tŏk-sē’mē-ə) n. Radiation sickness caused by the products of disintegration produced by the action of x-rays or other forms of radiation and by the depletion of certain cells and enzyme systems.

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