Crossword Genius

Line on a map connecting points of equal atmospheric pressure (6)

Ross

I believe the answer is:

isobar

'line on a map connecting points of equal atmospheric pressure' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for isobar that I've seen before include "Map-line showing places with equal air pressure" , "Line connecting points of equal air pressure" , "(Map) line of constant atmospheric pressure" , "Line of equal barometric pressure on a map" , "Pressure line on a weather map" .)

I've seen this clue in The Guardian.
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