cavern
nounUK /ˈkæv.ən/
US /ˈkæv.ɚn/
A cavern is a very big cave.
The explorers walked deep into the dark cavern.
RELATED WORDS
OTHER MEANINGS
2. A large, hollow space inside something.
The old tree had a cavern inside its trunk.
3. A room or space that is very large and dark, like a cave.
The empty hall felt like a cavern.
4. A deep, hollow place in the body.
The doctor examined the cavern in the lung.