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An instrument, such as a barometer, designed to indicate changes in atmospheric conditions.
(Physical Geography) (not in technical use) any of various instruments, esp a barometer, that measure atmospheric conditions
weath•er•glass(ˈwɛð ərˌglæs, -ˌglɑs)
any of various instruments, as a barometer or a hygroscope, designed to indicate the state of the atmosphere.