- a large rock, typically one that has been worn smooth by erosion.
noun: boulder, plural noun: boulders
- clay containing many large stones and boulders, formed by deposition from melting glaciers and ...
- another term for till
Oxford American Dictionary
- a large natural deposit of alluvial boulders, typically at a river mouth: across a narrow boulder bank is Cable Bay
- a geological formation of huge spherical rocks found on beaches between the towns of Hampden ... we stumbled across the rest of the tourists at the Moeraki boulders