barometer
US /bəˈrɑː.mə.t̬ɚ/
UK /bəˈrɑː.mə.t̬ɚ/
1.
an instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude.
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The barometer showed a sudden drop in pressure, indicating a storm was approaching.
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Mountaineers use a special type of barometer to measure altitude.
2.
something that indicates changes in something else
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The stock market is often seen as a barometer of the economy.
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Student attendance can be a good barometer of school morale.