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[hahy-grom-i-ter] /haɪˈgrɒm ɪ tər/
any instrument for measuring the water-vapor content of the atmosphere.
Origin of hygrometer
First recorded in 1660-70; hygro- + -meter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for hygrometer


any of various instruments for measuring humidity
Derived Forms
hygrometric (ˌhaɪɡrəˈmɛtrɪk) adjective
hygrometrically, adverb
hygrometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for hygrometer

1660s, from French hygromètre, from Greek hygro- (see hygro-) + -meter. Related: Hygrometry; hygrometric.

Online Etymology Dictionary, © 2010 Douglas Harper
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hygrometer in Science
Any of several instruments that measure humidity. The most common type of hygrometer consists of two, side-by-side mercury or electronic thermometers, one of which has a dry bulb, and one of which has a bulb wrapped with a wet cotton or linen wick. As water evaporates from the wet bulb, it absorbs heat from the thermometer, driving down its temperature reading. The difference in temperature between the two thermometers is then used to calculate the relative humidity. This type of hygrometer is also called a psychrometer. Other hygrometers make use of the temperatures at which dew forms and disappears to calculate the relative humidity. Older hygrometers used the length of a strand of hair, which stretches when it absorbs moisture, to measure relative humidity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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