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An instrument that uses the difference in readings between two thermometers, one having a wet bulb and the other having a dry bulb, to measure the moisture content or relative humidity of air.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Physical Geography) 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. Also called: wet-and-dry-bulb thermometer
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(saɪˈkrɒm ɪ tər)

an instrument for determining atmospheric humidity by the reading of two thermometers, the bulb of one being kept moist and ventilated.
[1720–30; < Greek psȳchró(s) cold + -meter]
psy`chro•met′ric (-krəˈmɛ trɪk) psy`chro•met′ri•cal, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.psychrometer - a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometerpsychrometer - a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air
dry-bulb thermometer - an ordinary thermometer with a dry bulb; used to measure the air temperature
hygrometer - measuring instrument for measuring the relative humidity of the atmosphere
wet-bulb thermometer - a thermometer with a bulb that is covered with moist muslin; used in a psychrometer to measure humidity
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