Operation to Cut Brain Nerves Surgically

Word Meaning:

LOBOTOMY — (surgery, chiefly historical) A surgical operation involving cutting into a lobe of a body organ, specifically (neurosurgery), a procedure, now largely disused, involving severing connections between the prefrontal cortex and the thalamic region of the frontal lobe of the brain to treat certain mental illnesses.

Definitions from Wiktionary.