According to the Merriam Webster Dictionary, a barometer is "an instrument that is used to measure air pressure and predict changes in the weather." According to the Etymonline Dictionary, barometer " comes from Greek baros- "weight," from suffixed form of PIE root gwere- "heavy" + -meter" word-forming element meaning "device or instrument for measuring;" commonly -ometer, occasionally -imeter; from French -mètre, from Greek metron "a measure".
Some words that come from baros- are: bariatric, isobar and bar. Some words that come from -meter are: chronometer, perimeter and gasometer.
You can see the word in this article
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