WordReference Random House Unabridged Dictionary of American English © 2016
hy•gro•scope  (hīgrə skōp′), 
  1. Meteorologyan instrument that indicates the approximate humidity of the air.
  • hygro- + -scope 1655–65

Collins Concise English Dictionary © HarperCollins Publishers::

hygroscope /ˈhaɪɡrəˌskəʊp/ n
  1. any device that indicates the humidity of the air without necessarily measuring it

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