treatment of mental disorders by means of brain surgery.
Compare lobotomy.

1935–40; psycho- + surgery

psychosurgeon [sahy-koh-sur-juhn] , noun
psychosurgical [sahy-koh-sur-ji-kuhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psychosurgery (ˌsaɪkəʊˈsɜːdʒərɪ)
any surgical procedure on the brain, such as a frontal lobotomy, to relieve serious mental disorders

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

psychosurgery psy·cho·sur·ger·y (sī'kō-sûr'jə-rē)
Brain surgery used to treat severe, intractable mental or behavioral disorders.

psy'cho·sur'geon (-sûr'jən) n.
The American Heritage® Stedman's Medical Dictionary
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Example sentences for psychosurgery
Psychosurgery has now become a rare procedure and is not a recommended treatment.
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