Crossword Genius

Line connecting points of equal pressure (6)

Ross

I believe the answer is:

isobar

(Other definitions for isobar that I've seen before include "Line on map connecting areas of equal pressure" , "Map-line showing places with equal air pressure" , "Barometric curve" , "Line on map showing atmospheric pressure" , "sign of pressure" .)

I've seen this clue in The Guardian.
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