psychrometer
noun
psy·chrom·e·ter
sī-ˈkrä-mə-tər
: a hygrometer consisting essentially of two similar thermometers with the bulb of one being kept wet so that the cooling that results from evaporation makes it register a lower temperature than the dry one and with the difference between the readings constituting a measure of the dryness of the atmosphere
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Merriam-Webster unabridged
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