Psychrometer
Pronunciation : Psy*chrom"e*ter
Part of Speech : n.
Etymology : [Gr. psychro`s cold + -meter: cf. F. psychrom?tre.]
Definition : Defn: An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.
Source : Webster's Unabridged Dictionary, 1913