- to explore caves, especially as a hobby.
Origin of spelunk
- a person who explores caves, especially as a hobby.
Origin of spelunker
- a person whose hobby is the exploration and study of caves
Word Origin and History for spelunking
"a cave bug; one who explores caves as a hobby," 1942, agent noun formed from obsolete spelunk "cave, cavern."
"cave, cavern," c.1300, from Old French spelonque or directly from Latin spelunca "a cave, cavern, grotto," from Greek spelynx (genitive spelyngos). An adjective, speluncar "of a cave" is recorded from 1855.