an instrument that indicates the approximate humidity of the air.

1655–65; hygro- + -scope

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World English Dictionary
hygroscope (ˈhaɪɡrəˌskəʊp)
any device that indicates the humidity of the air without necessarily measuring it

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American Heritage
Science Dictionary
hygroscope   (hī'grə-skōp')  Pronunciation Key 
An instrument that records changes in atmospheric humidity. Unlike a hygrometer, a hygroscope only indicates a change in relative humidity, without measuring the magnitude of the change.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The fresh cement paste was simply placed in a sample holder that fit tightly into the sealed hygroscope cell.
These large hygroscope nuclei are more efficient at producing droplets than the smaller nuclei found over continental regions.
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