'Hygroscope' definitions:
Definition of 'hygroscope'
From: WordNet
noun
Hygrometer that shows variations in the relative humidity of the atmosphere
Definition of 'Hygroscope'
From: GCIDE
- Hygroscope \Hy"gro*scope\, n. [Gr. ? wet + -scope: cf. F. hygroscope.] (Physics) An instrument which shows whether there is more or less moisture in the atmosphere, without indicating its amount. [1913 Webster]