A navy surgeon of senior grade.

(military) The ranking surgeon of a regiment in the British Commonwealth

dentist

plural of rocket surgeon

(humorous) Synonym of rocket scientist (“someone qualified to understand or handle that which is overly complex, detailed or confusing”)

A surgeon who performs top surgery.

plural of top surgeon

A surgeon who performs bottom surgery.

plural of bottom surgeon

Any of many species of reef-dwelling fishes, most of them brightly coloured, of the family Acanthuridae. They are named "surgeonfish" because they bear erectile, scalpel-like, dangerously sharp spines on either side of the caudal peduncle.