1. a person who explores caves as a hobby or sport

Examples

• The experienced spelunker descended into the limestone cave with proper safety equipment.
• Local spelunkers discovered a new chamber deep underground.
• She became a spelunker after visiting Mammoth Cave on vacation.
• The spelunker’s headlamp illuminated the narrow passage ahead.
• Safety training is essential for any beginning spelunker.
• The spelunker carefully mapped the cave system during the expedition.