the branch of medical science that treats disease or injury by operative procedures
"he is professor of surgery at the Harvard Medical School"
a room where a doctor or dentist can be consulted
"he read the warning in the doctor's surgery"
a room in a hospital equipped for the performance of surgical operations
"great care is taken to keep the operating rooms aseptic"
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"
A procedure involving major incisions to remove, repair, or replace a part of a body.
"After months of pain, my doctor finally scheduled surgery to repair the torn ligament in my knee."
In plain English: Surgery is a medical procedure where a doctor makes an incision to fix or remove something inside your body.
"The doctor told me that the surgery would go well and I could return home by evening."
Usage: Use surgery as an uncountable noun when referring to the medical field in general but count it with numbers like one surgery or two surgeries for specific procedures performed by doctors. Avoid confusing this term with "operation," which is often used interchangeably though can sometimes imply a shorter, less invasive process depending on regional usage.
The word surgery comes from the Latin chirurgia, which was borrowed from Ancient Greek for "hand work." It entered English via Old French and Middle English to describe medical treatment performed by a surgeon's hands.