- The definition of a lobotomy is a surgery where part of the brain is cut.
An example of a lobotomy is a surgery primarily used in history to treat psychosis.
Origin of lobotomy; from lobe + -tomy
Origin of lobotomylobe + –tomy.
From Ancient Greek Î»Î¿Î²ÏŒÏ‚ (lobos, “lobe (of the brain)") + Ï„Î¿Î¼Î® (tome, “cut, slice").