[thee-er-i-tish-uhn, theer-i-]
a person who deals with or is expert in the theoretical side of a subject: a military theoretician.

1885–90; theoretic(s) + -ian Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
theoretician (ˌθɪərɪˈtɪʃən)
a student or user of the theory rather than the practical aspects of a subject

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
If some one is surprised at the failure of the models he must be either a
  theoretician or an ignorant.
Modern portfolio theory poses a danger to those who believe in it too strongly
  and is a powerful challenge for the theoretician.
Neither a statesman nor a theoretician, he knew how to strike people at their
  weak spots and how to win battles by reading a map.
Try to imagine any theoretician today getting such a response.
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