Definition of "ontologist" [on•tol•o•gist]

• A scholar or theorist of ontology, or an adherent of a particular ontological doctrine. (noun)

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• "A more boring possibility: 'ontologist' is a recognized specialization within that queen of sciences, library science."
• "In The New York Times Book Review, the British pale-ontologist Simon Conway Morris threw down the gauntlet: he accused Wright "of a failure of nerve.""
• "An ontologist might treat the same sort of ailments a psychiatrist would treat, but maybe rejects the latter's unquestioned belief in such a thing as a psyche."