• synonyms


noun Medicine/Medical.
  1. treatment of disease by means of x-rays or of radioactive substances.
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Origin of radiotherapy

First recorded in 1900–05; radio- + therapy
Also called radiation therapy.
Related formsra·di·o·ther·a·pist, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for radiotherapy


  1. 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
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Derived Formsradiotherapeutic (ˌreɪdɪəʊˌθɛrəˈpjuːtɪk), adjectiveradiotherapeutically, adverbradiotherapist, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for radiotherapy


1903, from radio- + therapy.

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Online Etymology Dictionary, © 2010 Douglas Harper

radiotherapy in Medicine


  1. Treatment of disease with radiation, especially by selective irradiation with x-rays or other ionizing radiation and by ingestion of radioisotopes.
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Related formsra′di•o•thera•pist n.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.