noun Medicine/Medical.

treatment of disease by means of x-rays or of radioactive substances.

Origin of radiotherapy

First recorded in 1900–05; radio- + therapy
Also called radiation therapy.
Related formsra·di·o·ther·a·pist, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Contemporary Examples of radiotherapy

British Dictionary definitions for radiotherapy



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
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.

Online Etymology Dictionary, © 2010 Douglas Harper

radiotherapy in Medicine




Treatment of disease with radiation, especially by selective irradiation with x-rays or other ionizing radiation and by ingestion of radioisotopes.
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.