Etymology
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spelunker (n.)

"a cave bug; one who explores caves as a hobby," 1942, agent noun formed from obsolete spelunk "cave, cavern." The verb spelunk "explore caves" and the verbal noun spelunking are attested from 1946 and appear to be back-formations.

updated on November 06, 2013

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Definitions of spelunker from WordNet

spelunker (n.)
a person who explores caves;
Synonyms: potholer / speleologist / spelaeologist
From wordnet.princeton.edu, not affiliated with etymonline.