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boulder
/ˈbaʊldər/
large rock
The hikers climbed over the boulder to reach the summit.
A large rock blocked their path, and they had to climb over it.
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.
The term can also refer to a city in Colorado, USA.
Collocations
climb bouldersto scale large rocksboulder fieldan area covered with large rocks
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