Hȳ'gro-scōp'ic, a.

a. [Fr. hygroscopique.]

1. Pertaining to the hygroscope; not readily manifest to the senses, but capable of detection by the hygroscope;—said of moisture; as, glass is often covered with a film of hygroscopic moisture.
2. Having the property of readily imbibing moisture from the atmosphere, or of becoming coated with a thin film of moisture, as glass, &c.