Crossword Genius

A line connecting points of equal pressure (6)

Ross

I believe the answer is:

isobar

(Other definitions for isobar that I've seen before include "It indicates pressure" , "Line on map indicating atmospheric pressure" , "Pressure line on a weather map" , "Line showing points having equal barometric pressure at a given time" , "Equal-pressure line" .)

I've seen this clue in The Guardian.
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