Boulder

In geology, a boulder is a large piece of rock fragment that is larger than 25.6cm or roughly 10.1 inches in diameter or with a size value less than -8 on the φふぁい particle size scale with no upper size limit.

References

Webster’s New International Dictionary of the English Language. Springfield, Massachusetts: G. & C. Merriam Company. 1913.
"Boulder". Dictionary.com. Retrieved 24 August 2013.

Citations

"Boulder". Collins English Dictionary.

Other websites

Media related to Boulders at Wikimedia Commons

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