speleologist
/ˌspiːliˈɑːlədʒɪst/
noun
- A person who studies or explores caves as a scientist or hobbyist.
- Speleologists use special techniques to navigate tight underground passages.
- The speleologist discovered a new species of blind shrimp in the cave pool.
- My uncle is an amateur speleologist who leads weekend cave tours.
Synonyms