a person who specializes in or devotes himself to a particular area of activity, field of research, etc (as modifier) specialist knowledge

spe·cial·ist 1. One who is devoted to a particular occupation or branch of study or research: an antiquarian who is a specialist in... 2. A physician whose practice is limited to a particular branch of medicine or surgery, especially one who is certified... 3. Any of several noncommissioned ranks in ...

specialist definition: 1. someone who has a lot of experience, knowledge, or skill in a particular subject: 2. a doctor…. Learn more.

someone who has a lot of experience, knowledge, or skill in a particular subject or business area: specialist in sth She is a specialist in financial services and insurance.

A specialist is a person who has a particular skill or knows a lot about a particular subject. If you are housebound, you can arrange for a home visit from a specialist adviser. Peckham, himself a cancer specialist, is well aware of the wide variations in medical practice....a specialist in diseases of the nervous system.

specialist One who is devoted to a particular occupation or branch of study or research: “Specialists … tend to think in grooves”(... A physician whose practice is limited to a particular branch of medicine or surgery, especially one who is certified by... Any of several noncommissioned ranks in the ...