To spelunk is to explore natural caves. Geologists do a lot of spelunking.

This is a weird-looking word, but it has a simple meaning: to explore natural caves. Scientists who study natural formations of the Earth do a lot of spelunking. Through spelunking, you can find evidence of difference minerals, as well as fossils of various animals. Archaeologists spelunk to find remnants of previous civilizations. Some people spelunk as a hobby: they are spelunkers.

Definitions of spelunk
  1. verb
    explore natural caves
    synonyms: cave
    see moresee less
    type of:
    travel to or penetrate into
Word Family

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week