- an instrument that indicates the approximate humidity of the air.
Origin of hygroscope
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for hygroscope
Certain forms of hygroscope are popularly miscalled barometers.Meteorology
Charles Fitzhugh Talman
The chimney top with the dowel attached to it below is made to revolve so that the Hygroscope may be adjusted.Manual Training Toys for the Boy's Workshop
Harris W. Moore
The third is, the hygroscope, moving the punch, which shews the difference between the moistest and driest airs.The Introduction of Self-Registering Meteorological Instruments
Robert P. Multhauf
- 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
- 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.