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specialist

specialist: listen to American pronunciation/ˈspeʃ·ə·lɪst/ n [C]

Definition

someone who limits his or her studying or work to a particular area of knowledge, and who is an expert in that area:
She’s a specialist in financial management.
A specialist is also a doctor who works in and knows a lot about one particular area of medicine:
an eye/heart/joint specialist
(Definition of specialist n from the Cambridge Academic Content Dictionary © Cambridge University Press)

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