Longman Dictionary of Contemporary English homepage

specialist

 noun
     
Related topics: Nurses, Doctors, etc
spe‧cial‧ist S3 W3 [countable]
1 someone who knows a lot about a particular subject, or is very skilled at it [= expert]
specialist in
an attorney who is a specialist in banking law
2MN a doctor who knows more about one particular type of illness or treatment than other doctors:
a heart specialist
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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