1. 
   Isallobar
   A line on a weather map drawn through points where similar changes in barometric pressure have occurred in a given period of time. Isallobars show regions of rising and falling pressure.
   Found op http://www.aeroplanemonthly.com/glossary/
   
   
2. 
   isallobar
   isallobar A line on a weather chart connecting points of equal change of atmospheric pressure within a specified time period commonly used on synoptic surface charts to depict three-hourly local pressure tendencies.
   Found op http://www.wordinfo.info/words/index/info/view_unit/2795/
   
   
3. 
   ISALLOBAR
   The line of equal change in atmospheric pressure during a certain time period. It marks the change in pressure tendency.
   Found op http://www.weather.com/glossary/i.html
   
   
4. 
   Isallobar
   An isallobar is a line on a map passing through all the places with equal changes in pressure over a certain period.
   Found op http://www.probertencyclopaedia.com/browse/AI.HTM
   
   

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