Definition of barometer
1
: an instrument for determining the pressure of the atmosphere and hence for assisting in forecasting weather and for determining altitude (see altitude sense 1a)
2
: something that indicates fluctuations (as in public opinion)
housing sales and other economic barometers
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Merriam-Webster unabridged
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Time Traveler for barometer
The first known use of barometer was in 1632
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