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gamma knife

noun
1.
an machine that uses radiation with extreme accuracy to destroy abnormal tissue, esp in the brain
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Contemporary definitions for gamma knife
noun

a medical device using intersecting beams of gamma rays to treat brain tumors and lesions

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