spelunking


spe·lunk·er

S0624900 (spĭ-lŭng′kər, spē′lŭng′-)n. One who explores caves chiefly as a hobby; a caver.
[From obsolete spelunk, cave, from Middle English, from Old French spelunque, from Latin spēlunca, from Greek spēlunx.]
spe′lunk′ing n.
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