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[spi-luhngk] /spɪˈlʌŋk/
verb (used without object)
to explore caves, especially as a hobby.
Origin of spelunk
back formation from spelunker, spelunking Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for spelunk
  • If you plan to spelunk in caves without modern amenities, bring a headlamp and a flashlight with extra batteries.
Word Origin and History for spelunk

"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.

Online Etymology Dictionary, © 2010 Douglas Harper
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