Hygroscope
Pronunciation : Hy"gro*scope
Part of Speech : n.
Etymology : [Gr. -scope: cf. F. hygroscope.] (Physics)
Definition : Defn: An instrument which shows whether there is more or less moisture in the atmosphere, without indicating its amount.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder