spe·cial·ist

[spesh-uh-list]
noun
1.
a person who devotes himself or herself to one subject or to one particular branch of a subject or pursuit.
2.
a medical practitioner who devotes attention to a particular class of diseases, patients, etc.
3.
U.S. Army. an enlisted person of one of four grades having technical or administrative duties, the grades corresponding to those of corporal through sergeant first class but not requiring the exercise of command.
4.
Stock Exchange. a member of an exchange who executes orders in his or her name or for other stockbrokers in a single stock or a particular group of stocks and thus helps maintain the market in those securities on that exchange.

Origin:
1855–60; special + -ist

non·spe·cial·ist, noun, adjective
pre·spe·cial·ist, noun
sub·spe·cial·ist, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Specialist is always a great word to know.
So is bezoar. Does it mean:
a gadget; dingus; thingumbob.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
specialist (ˈspɛʃəlɪst) [Click for IPA pronunciation guide]
 
n
1.  a.  a person who specializes in or devotes himself to a particular area of activity, field of research, etc
 b.  (as modifier): specialist knowledge
2.  an enlisted rank in the US Army denoting technical qualifications that entitle the holder to a noncommissioned officer's pay
3.  ecology Compare generalist an organism that has special nutritional requirements and lives in a restricted habitat that provides these
 
special'istic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

specialist spe·cial·ist (spěsh'ə-lĭst)
n.
A physician whose practice is limited to a particular branch of medicine or surgery, especially one who is certified by a board of physicians.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Perhaps because it was close to his beloved mathematics, the specialist field
  he chose was financial economics.
When a specialist in any field publishes but cannot be read, others in the same
  field must rediscover his findings for themselves.
For those who don't want to expend even that much effort, specialist tour
  operators offer a variety of tailored packages.
The fact that an authors is a good oncologist does not make him a specialist in
  microwave research.
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