• synonyms


[ hahy-grom-i-ter ]
/ haɪˈgrɒm ɪ tər /


any instrument for measuring the water-vapor content of the atmosphere.

Nearby words

hygro-, hygrogram, hygrograph, hygrology, hygroma, hygrometer, hygrometric, hygrometry, hygrophilous, hygrophyte, hygroscope

Origin of hygrometer

First recorded in 1660–70; hygro- + -meter Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hygrometer

British Dictionary definitions for hygrometer


/ (haɪˈɡrɒmɪtə) /


any of various instruments for measuring humidity
Derived Formshygrometric (ˌhaɪɡrəˈmɛtrɪk), adjectivehygrometrically, adverbhygrometry, 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

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

Science definitions for hygrometer


[ hī-grŏmĭ-tər ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.