Psy‐chrom″e‐ter (?), n. [Gr. ψυχρόσ cold + -meter: cf. F. psychromètre.] An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.