/bə'rɒmɪtə(r); bə`rɑmətɚ/
n
1 instrument for measuring atmospheric pressure, used esp for forecasting the weather 气压计, 睛雨表（尤用以预报天气）
*The barometer is falling, ie Wet weather is indicated. 气压计在下降（表示天气潮湿）.
2 (fig 比喻) thing that indicates changes (in public opinion, market prices, sb's mood, etc) 显示（舆论、物价、人的情绪等的）变化的事物
*a reliable barometer of public feeling 反映公众情绪的可靠的标志.

n[C]

[Date: 1600-1700; Language: Greek;Origin: baros 'weight, pressure' + English -meter]
an instrument that measures changes in the air pressure and the weather, or that calculates height above sea level
something that shows any changes that are happening in a particular situation
　The skin is an accurate barometer of emotional and physical health.
>barometric [,bærə'metrɪk/