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Answer for the clue "The treatment of disease (especially cancer) by exposure to radiation from a radioactive substance ", 12 letters:
radiotherapy

Alternative clues for the word radiotherapy

Word definitions for radiotherapy in dictionaries

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1903, from radio- + therapy .

WordNet Word definitions in WordNet
n. (medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance [syn: radiation therapy , radiation , actinotherapy , irradiation ]

Wiktionary Word definitions in Wiktionary
n. The therapeutic use of ionizing radiation, almost exclusively used for the treatment of malignant disease.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Radiotherapy \Ra`di*o*ther"a*py\ (r[=a]`d[i^]*[o^]*th[e^]r"[.a]*p[y^]), n. [Radio- + therapy.] (Med.) Treatment of disease by means of x-rays or radioactivity. Radiotherapy of cancer is based on the fact that cancer cells are more sensitive to radiation ...

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun COLLOCATIONS FROM CORPUS ■ VERB receive ▪ In 10 patients receiving combined chemotherapy and radiotherapy , the endoscopic lesions resolved and biopsy specimens were negative. ▪ Other patients who did not receive radiotherapy received up to 15 intrathecal ...

Usage examples of radiotherapy.

And I moved to go over to him, to take his arm and make him listen while I told him about what was happening to my mum in the hospital down the road that morning, to tell him about the surgery, and to use words like mastectomy, chemotherapy, radiotherapy, lymphoedema, until I saw him squirm with shame at his cowardice.