isallobar

isallobar

[ahy-sal-uh-bahr]
noun Meteorology.
a line on a weather map or chart connecting points having equal pressure changes.

Origin:
1910–15; is- + allo- + -bar

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Collins
World English Dictionary
isallobar (aɪˈsæləˌbɑː)
 
n
meteorol a line on a map running through places experiencing equal pressure changes

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
isallobar   (ī-sāl'ə-bär')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
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