Commissurotomy

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The American Heritage® Dictionary of the English Language, 4th Edition
  • n. Surgical incision of a commissure in the body, as one made in the heart to relieve constriction of the mitral valve or one made in the brain to treat certain psychiatric disorders.
  • Wiktionary, Creative Commons Attribution/Share-Alike License
  • n. The surgical division of a commissure or similar structure.
  • Word Usage
    "As support, they appeal to commissurotomy patients who after their brain hemispheres are divided seem to act as if each half were itself a functioning mind."