hygrometer

[hahy-grom-i-ter]
noun
any instrument for measuring the water-vapor content of the atmosphere.

Origin:
1660–70; hygro- + -meter

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Collins
World English Dictionary
hygrometer (haɪˈɡrɒmɪtə)
 
n
any of various instruments for measuring humidity
 
hygrometric
 
adj
 
hygro'metrically
 
adv
 
hy'grometry
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hygrometer   (hī-grŏm'ĭ-tər)  Pronunciation Key 
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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Encyclopedia Britannica
Encyclopedia

hygrometer

instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
As if this weren't enough, a hygrometer has appeared on the wall next to the nightstand.
Also, a hair hygrometer needs frequent adjustment and calibration.
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