Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The use of ionizing radiation, either from an external source such as an x-ray machine or from an implant, to destroy cancerous or other diseased tissue.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun medicine The use of a directed beam of X-rays or other ionizing radiation to destroy diseased tissue

Etymologies

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