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radiotherapy

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(-t̸her′ə pē)

noun

the treatment of disease by the use of X-rays or rays from a radioactive substance

Origin: radio- + therapy

See radiotherapy in American Heritage Dictionary 4

noun pl. ra·di·o·ther·a·pies

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

Related Forms:

raˌdi·o·therˈa·pist noun

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