1. The study of subterranean living organisms, particularly in karst caves and other openings in rock formations [9, 21]. 2. The scientific study of cave animal life, or the biology of caves, karst, and groundwater. A biologist who specializes in this study is called a biospeleologist [23]. Synonyms: (French.) biospeleologie, biospeologie; (German.) Biospelaologie; (Greek.) biospeleology; (Italian.) biospeleogia; (Russian.) biospeleologija; (Spanish.) biospeleologia; (Turkish.) biyospeleoloji, magara canlilari bilimi; (Yugoslavian.) biospeleologija.