from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An area of irregular limestone in which erosion has produced fissures, sinkholes, underground streams, and caverns.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of land formation, usually with many caves formed through the dissolving of limestone by underground drainage.
German, after the Karst, a limestone plateau near Trieste.(American Heritage® Dictionary of the English Language, Fourth Edition)
From the Karst, a region of modern-day Slovenia typified by such landscape; from German Karst, from Slovene Kras. (Wiktionary)