WordNet (r) 3.0 (2006):

prefrontal lobotomy
    n 1: surgical interruption of nerve tracts to and from the
         frontal lobe of the brain; often results in marked
         cognitive and personality changes [syn: lobotomy,
         leukotomy, leucotomy, prefrontal lobotomy,
         prefrontal leukotomy, prefrontal leucotomy, frontal
         lobotomy]