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hygroscope (n.)

"device which indicates atmospheric humidity," 1660s, from hygro- "wet, moist; moisture" + -scope. It indicates the presence of moisture but not the amount (which is measured by a hygrometer). Related: Hygroscopic.

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Definitions of hygroscope from WordNet

hygroscope (n.)
hygrometer that shows variations in the relative humidity of the atmosphere;
From wordnet.princeton.edu