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A megalith is a large, prehistoric stone monument, typically used for religious or ceremonial purposes.
"Megalith" means "large stone"; an antonym might be "pebble".
A megalith is a large stone that forms a prehistoric monument, such as a stone circle or chamber. Stonehenge is a well-known Megalith.
builders
A megalith is a large stone that has been used to construct a structure or monument, either alone or together with stones.