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An instrument, such as a barometer, designed to indicate changes in atmospheric conditions.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) (not in technical use) any of various instruments, esp a barometer, that measure atmospheric conditions
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
weath•er•glass(ˈwɛð ərˌglæs, -ˌglɑs)
any of various instruments, as a barometer or a hygroscope, designed to indicate the state of the atmosphere.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.