noun
brain surgeon
A medical doctor who specializes in surgery on the brain.
彼は有名な脳外科医です。
He is a famous brain surgeon.
Refers to the field of brain surgery, while 脳外科医 refers to the surgeon.
Compound of 脳 (のう, 'brain'), 外科 (げか, 'surgery'), and 医 (い, 'doctor').