SPELUNKING Meaning of SPELUNKING in English [ spɪ'lʌŋkɪŋ ]■ noun N. Amer. the exploration of caves, especially as a hobby.Derivativesspelunker noun Origin1940s: from obs. spelunk 'cave' (from L. spelunca ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004