Noun
1. the branch of medical science that treats disease or injury by operative procedures;
"he is professor of surgery at the Harvard Medical School"2. a room where a doctor or dentist can be consulted;
"he read the warning in the doctor's surgery"3. a room in a hospital equipped for the performance of surgical operations;
"great care is taken to keep the operating rooms aseptic"4. a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body;
"they will schedule the operation as soon as an operating room is available""he died while undergoing surgery"