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The Collaborative International Dictionary
Dianoetic

Dianoetic \Di`a*no*et"ic\, a. [Gr. ?; dia` through + ? to revolve in the mind.] (Metaph.) Pertaining to the discursive faculty, its acts or products.

I would employ . . . dianoetic to denote the operation of the discursive, elaborative, or comparative faculty.
--Sir W. Hamilton.

Wiktionary
dianoetic

a. Pertaining to reason or thinking; intellectual.

WordNet
dianoetic

adj. proceeding to a conclusion by reason or argument rather than intuition [syn: discursive]