No‐e′ma‐tach″o‐graph (?), n. [Gr. νόημα the understanding + τάχοσ swiftness + -graph.] An instrument for determining and registering the duration of more or less complex operations of the mind. Dunglison.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.