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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 from WordNet
Dictionary entries near spelunk
spellbound
spell-check
speller
spelling
spelt
spelunk
spelunker
Spencer
Spencerian
spend
spending