Crossword Genius

Chart pressure line (6)

Ross

I believe the answer is:

isobar

(Other definitions for isobar that I've seen before include "Meteorological line joining points of equal pressure" , "Air pressure line on a weather chart" , "Line on map indicating barometric pressure" , "Met map pressure line" , "Barometric curve" .)

I've seen this clue in The Times.
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