[ hahy-gruh-skohp ]
/ ˈhaɪ grəˌskoʊp /


an instrument that indicates the approximate humidity of the air.

Origin of hygroscope

First recorded in 1655–65; hygro- + -scope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hygroscope

British Dictionary definitions for hygroscope

/ (ˈhaɪɡrəˌskəʊp) /


any device that indicates the humidity of the air without necessarily measuring it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for hygroscope

[ hīgrə-skōp′ ]

An instrument that records changes in atmospheric humidity. Unlike a hygrometer, a hygroscope only indicates a change in relative humidity, without measuring the magnitude of the change.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.