n.1 a medical practitioner qualified to practise surgery.
2 a medical officer in a navy or army or military hospital.
Phrases and idioms:
surgeon fish any tropical marine fish of the genus Acanthurus with movable lancet-shaped spines on each side of the tail. surgeon general (pl. surgeons general) US the head of a public health service or of an army etc. medical service. surgeon's knot a reef-knot with a double twist.
Etymology: ME f. AF surgien f. OF serurgien (as SURGERY)