Crossword Genius

Lines showing equal pressure (7)

Ross

I believe the answer is:

isobars

(Other definitions for isobars that I've seen before include "Map lines of equal pressure" , "Lines of equal atmospheric pressure" , "15 is strong when they are close" , "Lines linking places of equal barometric pressure" , "Lines on map indicating atmospheric pressure" .)

I've seen this clue in The Guardian.
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