specialist

Specialist is defined as an expert in some field or a person who concentrates his or her energies on a specific field.

(noun)

A doctor who focuses on care of the heart is an example of a heart specialist.

The definition of specialist is having expert knowledge in a field, or someone or something that concentrates on a limited area.

(adjective)

A bookstore that only sells magic and paranormal books is an example of a specialist book store.

See specialist in Webster's New World College Dictionary

noun

a person who specializes in a particular field of study, professional work, etc.
☆ U.S. Army any of six grades for enlisted personnel with technical training and duties, corresponding to the grades of corporal through sergeant major

adjective

of a specialist or specialism

See specialist in American Heritage Dictionary 4

noun

One who is devoted to a particular occupation or branch of study or research: “Specialists . . . tend to think in grooves” (Elaine Morgan).
A physician whose practice is limited to a particular branch of medicine or surgery, especially one who is certified by a board of physicians: a specialist in oncology.
Any of several noncommissioned ranks in the U.S. Army that correspond to that of corporal through sergeant first class.

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