from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of several instruments used to measure the relative humidity of the atmosphere; especially a wet-and-dry-bulb hygrometer.
from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.
from The Century Dictionary and Cyclopedia
- n. An instrument for determining the tension of the aqueous vapor in the air or the relative humidity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air
psychro- + -meter (Wiktionary)