Hygroscopic
Pronunciation : Hy`gro*scop"ic
Part of Speech : a.
Etymology : [Cf. F. hygroscopique.]
Definition : 1. Of or pertaining to, or indicated by, the hygroscope; not readily manifest to the senses, but capable of detection by the hygroscope; as, glass is often covered with a film of hygroscopic moisture.
2. Having the property of readily inbibing moisture from the atmosphere, or of the becoming coated with a thin film of moisture, as glass, etc.
Source : Webster's Unabridged Dictionary, 1913