specialist

/ˈspeʃəlɪst/ noun [C]

Definition

› 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.

› FINANCE, STOCK MARKET someone who works on a US stock market and buys and sells shares in particular types of companies: Specialists on regional exchanges sometimes have lower dealing costs than those in New York.

(Definition of specialist noun from the Cambridge Business English Dictionary © Cambridge University Press)