Etymology
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spelunk (n.)

"a cave, cavern, a vault," c. 1300, from Old French spelonque (13c.) or directly from Latin spelunca "a cave, cavern, grotto," from Greek spelynx (accusative spelynga, genitive spelyngos) "a cave, cavern," from spelos "a cave." An adjective, speluncar "of a cave" is recorded from 1855.

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Definitions of spelunk

spelunk (v.)
explore natural caves;
Synonyms: cave
From wordnet.princeton.edu