an expert in making diagnoses, especially a medical doctor.

1865–70; diagnostic + -ian

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World English Dictionary
diagnostician (ˌdaɪəɡnɒsˈtɪʃən)
a specialist or expert in making diagnoses

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

diagnostician di·ag·nos·ti·cian (dī'əg-nŏ-stĭsh'ən)
A person who diagnoses, especially a physician specializing in medical diagnostics.

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
Ironically, he's a genius diagnostician, a brilliant solver of medical
He walks with difficulty, and has to use a cane-the result of an unbrilliant
  diagnostician's mistake earlier in his life.
He's a great diagnostician, and he's got a great bedside manner.
He is an expert diagnostician, a quality he shares with his author.
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