[ad_1] noun Meteorology.
  1. a line on a weather map or chart connecting points having equal pressure changes.


  1. meteorol a line on a map running through places experiencing equal pressure changes

  1. A line on a weather map connecting places having equal changes in atmospheric pressure within a given period of time. Isallobars measure pressure tendency, a value that describes both the difference in barometric pressure at the beginning and end of a given time period as well as the pattern-falling, rising, or steady-of pressure change.

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