A sharp or jagged ridge, particularly in geology; a needle-like mountain peak or rock formation.
From Old French 'aigre' meaning sharp or sour, derived from Latin 'acrum' (sharp); relates to German 'Ager' and other Alpine terminology for sharp peaks.
Alpine climbers use precise terminology for different peak shapes—an 'aiger' specifically describes that dramatic needle-like formation, and the famous Eiger mountain in Switzerland gets its name from this word.
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