Definition from Wiktionary, the free dictionary
surgeon (plural surgeons)
- One who performs surgery; a doctor who performs operations on people or animals.
- The surgeon refused to operate because the patient was her son.
Usage notes 
- In the UK, a surgeon holds a fellowship or a postgraduate degree in order to be known as a surgeon. For instance: FRCS or Master of Surgery
- In the United States, a surgeon is a subcategory of doctors (physicians) whose practice is largely or exclusively focused on surgery. They generally hold a credential from a medical body regulating the specialty in which they practice.
- sawbones (slang)
Derived terms 
doctor who performs surgery
surgeon m (plural surgeons)