Found 2 items, similar to hygroscope.
English → English (WordNet) Definition: hygroscope hygroscope n : hygrometer that shows variations in the relative humidity of the atmosphere
English → English (gcide) Definition: Hygroscope 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]