1) 洞穴学 Parts 洞穴 学 Link copied! Meaning Wikipedia EN Speleology or Spelaeology (also spelled spelæology or spelaeology) is the scientific study of caves and other karst features, their make-up, structure, physi... More Kanji 洞 ドウ den, cave, excavation 穴 ケツ hole, aperture, slit 学 ガク study, learning, science
