| 1. | Meteorology. any instrument that measures atmospheric pressure. Compare aneroid barometer, mercury barometer. |
| 2. | anything that indicates changes. |
An instrument that measures atmospheric pressure.
Note: In general, when the barometer falls in response to a drop in pressure, bad weather is approaching; when the barometer rises because of an increase in pressure, good weather will follow.
barometer
| barometer (bə-rŏm'ĭ-tər) Pronunciation Key
An instrument for measuring atmospheric pressure. Barometers are used in determining height above sea level and in forecasting the weather. The two primary types of barometers are the aneroid and the mercury barometer. |