a surgical operation in which a lobe of the brain, esp. the frontal lobe of the cerebrum, is cut into or across: now rarely used as a treatment for psychoses
See lobotomy in American Heritage Dictionary 4
(lə-bŏtˈə-mē, lō-)
nounpl.lo·bot·o·mies
Surgical incision into the frontal lobe of the brain to sever one or more nerve tracts, a technique formerly used to treat certain mental disorders but now rarely performed.