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theorist

[thee-er-ist, theer-] /ˈθi ər ɪst, ˈθɪər-/
noun
1.
a person who theorizes.
2.
a person who deals mainly with the theory of a subject:
a theorist in medical research.
Origin of theorist
1585-1595
First recorded in 1585-95; theor(y) + -ist
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for theorist

theorist

/ˈθɪəˌrɪst/
noun
1.
the originator of a theory; a person who is concerned with theory; a theoretician
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
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Word Origin and History for theorist
n.

1590s; see theory + -ist.

Online Etymology Dictionary, © 2010 Douglas Harper
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11
10
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