[mass noun](Geology)landscape underlain by limestone which has been eroded by dissolution, producing ridges, towers, fissures, sinkholes and other characteristic landforms (地质)喀斯特 [as modifier]karst topography. 喀斯特地形学。 [count noun]it was strange country, broken into hummocks and karsts and mesas. 这是一个地形奇特的地区,分布着波状地形、喀斯特地形和平顶山地形。