theorist

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

Origin:
1585–95; theor(y) + -ist

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World English Dictionary
theorist (ˈθɪəˌrɪst)
 
n
the originator of a theory; a person who is concerned with theory; a theoretician

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences for theorists
Nevertheless, some historians and naval theorists question the value of the battleship.
The above definition of the commutator is used by group theorists.
Several theorists detect successive phases in the development of conflicts.
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