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