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boulder
Aboulder is a large, smooth rock. (noun)
- When you build a retaining wall and use a large rock in the wall, this rock is an example of a boulder.
- A rock that has been detached from the earth by erosion or for other reasons and that is free to be moved about is an example of a boulder.
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See boulder in Webster's New World College Dictionary
See boulder in American Heritage Dictionary 4
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