isallobar

noun

is·​al·​lo·​bar (ˌ)ī-ˈsa-lə-ˌbär 

: an imaginary line or a line on a chart connecting the places of equal change of atmospheric pressure within a specified time

isallobaric

ˌī-ˌsa-lə-ˈbär-ik 

-ˈber-

-ˈba-rik 

adjective

Word History

Etymology

International Scientific Vocabulary is- + all- + -bar (as in isobar)

First Known Use

1910, in the meaning defined above