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1. Geography the lowest point of a ridge connecting two mountain peaks, often constituting a pass
2. Meteorol a pressure region between two anticyclones and two depressions, associated with variable weather
A high, sharp-edged pass occurring in a mountain ridge, usually produced by the headward erosion of opposing cirques.
The point of intersection of a trough and a ridge in the pressure pattern of a weather map; it is the point of relatively lowest pressure between two highs and the point of relatively highest pressure between two lows. Also known as neutral point; saddle point.
On drawings, abbr. for column.
An area of almost uniform pressure between two highs and two lows. No isobars define its boundary. The two isobars on two low-pressure sides have the same value. However, isobars on anticyclonic sides have equal value but at one interval higher. Also referred to as saddleback shape.