An underground cave with a naturally arched roof
A cavity, gap, or space:
An opening or perforation:
A small, squalid room
The definition of a cavern is a large cave.
A naturally occurring underground hollow or passage, especially one with an opening to the surface of the Earth. Caves can form through a variety of processes, including the dissolution of limestone by flowing water, the differential cooling of volcanic magma (which occurs when the outside surface of the lava cools, but the inside continues to flow downwards, forming a hollow tube), or the action of wind and waves along a rocky coast.
Any similar passage or hole for shelter, refuge, etc.
Find another word for grottos. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for grottos, like: vaults, recesses, hollows, holes, dens, caverns, caves and burrows.