Crossword Genius

Line on a weather map (6)

Ross

I believe the answer is:

isobar

'line on a weather map' is the definition.
(I've seen this in another clue)

This is the entire clue.

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

I've seen this clue in The Daily Mail and the Evening Standard.
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