hygroscope

hy·gro·scope  (hgr-skp)

n.

An instrument that indicates changes in atmospheric humidity.

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hygroscope

Noun

any device that indicates the humidity of the air without necessarily measuring it, such as an animal or vegetable fibre which contracts with moisture [Greek hugros wet + skopein to observe]

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hygroscope  (hgr-skp)

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.

Thesaurus

Noun

1.

hygroscope - hygrometer that shows variations in the relative humidity of the atmosphere hygrometer - measuring instrument for measuring the relative humidity of the atmosphere