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psychrometer
CIDE DICTIONARY
psychrometer, n. [Gr. psychro`s 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. [1913 Webster]
OXFORD DICTIONARY
psychrometer, n. a thermometer consisting of a dry bulb and a wet bulb for measuring atmospheric humidity.
Etymology
Gk psukhros cold + -METER
For further exploring for "psychrometer" in Webster Dictionary Online