One of the mysteries of the English language finally explained.
Grooves and fissures, typically separated by sharp ridges, produced in a hard limestone surface by water erosion.
- ‘In the northern limestone Alps large bare karst areas with impressive Karren exist.’
- ‘Karren are particularly common on limestone pavements.’
- ‘As a result of karren development the fissures are widened and channel edges are eroded.’
Late 19th century: from German Karren.
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