Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Radiosurgery" Definition
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.
Source: American Heritage Dictionary
The use of a directed beam of x-rays or other ionizing radiation to destroy diseased tissue.
Source: Wiktionary
Surgery using precisely targeted to destroy tissue without cutting.
Source: Merriam-Webster
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