specialist /ˈspɛʃəlɪst/noun 7adjective 1forms 3 noun7 •someone with deep knowledge of one part of a subject •A physician whose practice is limited to a particular branch of medicine or surgery.Dr. Robert Leroy Hutton, a retired specialist in internal medicine and a well‐known diagnostician, died yesterday here. — 1964 •A player on a team who primarily employs one particular skill or takes one particular role. •(US) Any of several non-commissioned ranks corresponding to that of corporal. •An organism that is specialized for a particular environment.The tree Lepidothamnus laxifolius is a high alpine specialist found in high-altitude bog communities and in scrub. •A stenotopic species. •A sixth-former at Eton College. adjective1 •(UK) Specialised, involving detailed knowledge of a restricted topic.This was a highly specialist job, and it has been very carefully carried out so that it is very hard to see that these windows are now modern replacements. — 2021 formsspecialists · more specialist · most specialist