Relating to a barometer or the measurement of atmospheric pressure, or describing something that changes rapidly like a barometer reading.
From barometer (Greek baro- 'weight' + -meter 'measure') + -ic suffix meaning 'of or relating to.' The term emerged in the 17th century alongside the invention of the barometer to describe pressure-related phenomena.
The word 'barometric' became popular during Europe's scientific revolution when scientists realized they could predict weather by measuring air pressure—the discovery eventually led to modern weather forecasting and the realization that our entire atmosphere has weight and presses down on us.
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