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barometer

[bəˈrɑːmɪtər]

n. an instrument for determining the pressure of the atmosphere; something that indicates fluctuations (as in public opinion)

A pianist's fingers dancing across ivory keys in a hall

The barometer filled the cathedral with hauntingly beautiful sound.

-meter“” thermometer n. (thermo=heat) diameter n. dia=across perimeter n. ⻓per=around, through