- (neurosurgery) Surgical removal of a hemisphere (i.e., one-half) of the brain, usually performed to control otherwise uncontrollable epilepsy.
Etymology: From hemisphere + -ectomy.
- So Lacy's parents had brought her to Johns Hopkins for a , which is probably the most radical procedure in neurosurgery. -- Christine Kennelly, The New Yorker, July 3, 2005, p.36.
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