spelunk 洞穴，洞穴探险来自拉丁语 spelunca,来自希腊语 spelynx,来自 spelos,洞穴，可能来自 PIE*spel,分开，劈开， 词源同 spill,splinter.
- 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.
