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theorist

[thee-er-ist, theer-]
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noun
  1. a person who theorizes.
  2. a person who deals mainly with the theory of a subject: a theorist in medical research.
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Origin of theorist

First recorded in 1585–95; theor(y) + -ist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for theorist

theorist

noun
  1. the originator of a theory; a person who is concerned with theory; a theoretician
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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 theorist

n.

1590s; see theory + -ist.

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Online Etymology Dictionary, © 2010 Douglas Harper