practitioner
/prækˈtɪʃənə(r)/noun
- a person actively engaged in an art, discipline, or profession, especially medicine（艺术、学科或职业, 尤指医药）从业者：
patients are treated by skilled practitioners.
病人接受医术高明的开业医生治疗。
词源
mid 16th cent.: extension of obsolete practitian, variant of PRACTICIAN.