karst 
(kärst)
(kärst)n.
An area of irregular limestone in which erosion has produced fissures, sinkholes, underground streams, and caverns.
[German, after the Karst, a limestone plateau near Trieste (where geologists first studied karstic landscapes) .]
karstic adj.
karstYorkshire Dales National Park, England
- extraembryonic
- extragalactic
- extrahepatic
- extra-high voltage
- extrajudicial
- extrajudicially
- extralegal
- extralegally
- extramarital
- extramundane
- extramural
- extraneous
- extraneously
- extraneousness
- extranet
- extranuclear
- extraocular muscle
- extraordinaire
- extraordinarily
- extraordinary
- extrapolate
- extrapolation
- extrapolative
- extrapolator
- extrapyramidal