n. someone who constructs theories, especially in the arts or sciences
n. an expert of some theory (v.)
the GNU version of the Collaborative International Dictionary of English
n. One who forms theories; one given to theory and speculation; a speculatist.
The Century Dictionary and Cyclopedia
n. One who forms theories; one given to theory and speculation; a speculatist. It is often used with the implication of a lack of practical capacity.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who theorizes (especially in science or art)
Word Usage
"In that realm, a number theorist is not welcome to publish on high-energy physics, and a biochemist is not often invited to a conference of economists — however much their tangential perspectives on the topic might possibly stimulate new thinking."