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Barometer

/bəˈrämitər/

Noun, pl. barometers

1. An instrument measuring atmospheric pressure, used esp. in forecasting the weather and determining altitude. (Google Dictionary)

2. A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. (wikipedia.org)

3. Anything used as a gauge or indicator. (wiktionary.org)

Word origin: From Ancient Greek βάρος (“weight”) +‎ –meter.

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