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psychrometer (n.)

"instrument to measure moisture in the atmosphere," 1838, from Latinized form of Greek psykhros "cold" (see psychro-) + -meter. Earlier it was another word for "thermometer" (1749). "Badly employed in current use" [OED]. Related: Psychrometric; psychrometrical; psychrometry.

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Definitions of psychrometer

psychrometer (n.)
a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air;
From wordnet.princeton.edu