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hygroscope

[ hahy-gruh-skohp ]
/ ˈhaɪ grəˌskoʊp /
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noun

an instrument that indicates the approximate humidity of the air.

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Origin of hygroscope

First recorded in 1655–65; hygro- + -scope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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British Dictionary definitions for hygroscope

hygroscope
/ (ˈhaɪɡrəˌskəʊp) /

noun

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

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.
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