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The Collaborative International Dictionary

Hygroscopic \Hy`gro*scop"ic\, a. [Cf. F. hygroscopique.]

  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.

Douglas Harper's Etymology Dictionary

1775, from hygroscope (1660s), from hygro- + -scope.


a. (context physics chemistry English) Readily taking up and retaining water, especially from the atmosphere.


adj. absorbing moisture (as from the air)

Usage examples of "hygroscopic".

It should be ignited and cooled out of contact with air just before using, since it is hygroscopic.