Crossword Genius

Lines of equal air pressure on a weather chart (7)

Ross

I believe the answer is:

isobars

(Other definitions for isobars that I've seen before include "Air boss (anag.)" , "What may be featured on map" , "Lines of equal atmospheric pressure" , "Map lines of equal pressure" , "Lines on a weather map" .)

I've seen this clue in The Irish Times.
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