boulder
/ˈbaʊldər/noun★Beginner
general
A large rock or stone, often rounded by erosion.
The park is famous for its giant boulders that climbers scale.
The park has very large rocks that people climb for sport.
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The term can also refer to a city in Colorado, USA.
Collocations
climb bouldersto scale large rocksboulder fieldan area covered with large rocks
Synonyms
💡Pro Tip
Geological Context
Boulders are often formed through glacial erosion or weathering.
📖Word Origin
From Middle English 'bulder,' possibly from Old Norse 'buldr,' meaning 'rock.'
📝Usage Notes
In geology, a boulder is defined as a rock fragment larger than 256 millimeters in diameter.
English Dictionary