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| a cyclone that forms on a front and, in maturing, produces an increasingly sharp, wavelike deformation of the front |
| fog caused by cold air flowing over a body of comparatively warm water and giving the appearance of smoke or steam |
| 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. |
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.