- a person who explores caves, especially as a hobby.
Origin of spelunker
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a person whose hobby is the exploration and study of caves
C20: from Latin spēlunca, from Greek spēlunx a cave
Word Origin and History for spelunker
"a cave bug; one who explores caves as a hobby," 1942, agent noun formed from obsolete spelunk "cave, cavern."
Online Etymology Dictionary, © 2010 Douglas Harper