In this way a small area of the surface of the earth is converted into a hygroscope, and these test surfaces tell us whether the ground is cooled to the dew-point or not.    From Wordnik.com.  [Scientific American Supplement, No. 530, February 27, 1886] Reference

Jungle, expected to be the first TechFace model to launch, is a sturdy bar style, quad band (WCDMA2100, GSM 900/1800/1900) water proof phone featuring dust-proof, shock-resistant, GPS, altimeter, barometer, thermometer, hygroscope and light functions.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference