theorist Meaning, Definition & Usage
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noun someone who theorizes (especially in science or art)
theoretician; theoriser; idealogue; theorizer.
WordNet
The"o*rist noun
Etymology
Cf. F.Definitions
One who forms theories; one given to theory and speculation; a speculatist. Cowper.The greatest theoretists have given the preference to such a government as that which obtains in this kingdom. Addison.
2. A scientist who forms theories about natural phenomena, based on the data gathered by others, rather than himself performing experiments to test the theories. Contrasted with experimentalist.