psychrometer

[sahy-krom-i-ter]
noun
an instrument for determining atmospheric humidity by the reading of two thermometers, the bulb of one being kept moist and ventilated.

Origin:
1720–30; psychro- + -meter

psychrometric [sahy-kruh-me-trik] , psychrometrical, adjective
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World English Dictionary
psychrometer (saɪˈkrɒmɪtə)
 
n
Also called: wet-and-dry-bulb thermometer a type of hygrometer consisting of two thermometers, one of which has a dry bulb and the other a bulb that is kept moist and ventilated. The difference between the readings of the thermometers gives an indication of atmospheric humidity

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American Heritage
Medical Dictionary

psychrometer psy·chrom·e·ter (sī-krŏm'ĭ-tər)
n.
An instrument that uses the difference in readings between thermometers specialized to measure the moisture content or relative humidity of air.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
psychrometer   (sī-krŏm'ĭ-tər)  Pronunciation Key 
See under hygrometer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

psychrometer

a hygrometer composed of two similar thermometers. The bulb of one thermometer is kept wet (by means of a thin, wet cloth wick) so that the cooling that results from evaporation makes it register a lower temperature than the dry-bulb thermometer. When readings are taken simultaneously, it is possible (with the use of psychrometric tables) to determine the relative humidity and dew-point temperature of the air. A decrease in the humidity of the air brings an increase in the difference between dry- and wet-bulb temperatures, called the wet-bulb depression. See also hygrometer.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Technically, the ambient temperature registered by the dry-bulb thermometer of
  a psychrometer.
Explain that the psychrometer hangs from a chain attached to a metal bar which
  the students will hold tightly at all times.
The room shall be large enough to permit the use of a manually operated sling
  psychrometer.
The instrument used to measure humidity is called a psychrometer.
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