from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Brain surgery used to treat severe, intractable mental or behavioral disorders.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Surgery of the brain to treat or alleviate mental illness.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. brain surgery on human patients intended to relieve severe and otherwise intractable mental or behavioral problems
From psycho- + surgery. (Wiktionary)