cavern

noun

1. a cave, especially one that is large and mostly underground.
2. Pathology. a cavity that is produced by disease, especially one produced in the lungs by tuberculosis.

verb (used with object)

3. to enclose in or as if in a cavern.
4. to hollow out to form a cavern.

noun

1. a cave, esp when large and formed by underground water, or a large chamber in a cave

verb (tr)

2. to shut in or as if in a cavern
3. to hollow out

n.

late 14c., from Old French caverne (12c.) “cave, vault, cellar,” from Late Latin caverna “cave,” from Latin cavus “hollow” (see cave (n.)). In Old English such a land feature might be called an eorðscræf.

1. A large cave.