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internist

[in-tur-nist, in-tur-nist]
noun
  1. a physician specializing in the diagnosis and nonsurgical treatment of diseases, especially of adults.
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Origin of internist

An Americanism dating back to 1900–05; intern(al medicine) + -ist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for internist

internist

noun mainly US
  1. a physician who specializes in internal medicine
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for internist

n.

1904, American English, from internal medicine + -ist.

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Online Etymology Dictionary, © 2010 Douglas Harper

internist in Medicine

internist

(ĭn-tûrnĭst)
n.
  1. A physician specializing in internal medicine.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.