Weather-glass

weatherglass

[weth-er-glas, -glahs]
noun
any of various instruments, as a barometer or a hygroscope, designed to indicate the state of the atmosphere.

Origin:
1620–30; weather + glass

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World English Dictionary
weatherglass (ˈwɛðəˌɡlɑːs)
 
n
(not in technical use) any of various instruments, esp a barometer, that measure atmospheric conditions

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