Definition of "Surgery" :

noun: a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body

"He died while undergoing surgery."

noun: a room in a hospital equipped for the performance of surgical operations

noun: a room where a doctor or dentist can be consulted

"He read the warning in the doctor's surgery."

noun: the branch of medical science that treats disease or injury by operative procedures

"He is professor of surgery at the Harvard Medical School."