boulder

noun

boul·​der ˈbōl-dər How to pronounce boulder (audio)
variants or less commonly bowlder
: a detached and rounded or much-worn mass of rock
bouldered adjective
bouldery adjective

Examples of boulder in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Deploying nets and traps from armored breakwalls and along shoreline boulders, their efforts weren't successful in 2024. Keith Matheny, Freep.com, 3 July 2026 Its landscape features large boulders, sweeping views and pine trees (especially the eponymous loop). Jaclyn Cosgrove, Los Angeles Times, 2 July 2026 Rock glaciers are slow-moving masses of rock debris and ice that flow downhill the same way that glaciers do, but they are covered by a thick layer of rock and boulders that can easily be mistaken for stable ground. Ashlesha Khatiwada, The Conversation, 1 July 2026 On the facing page was Gompers’s block print/line drawing of the Tibetan saint and poet Milarepa sitting in a lotus position, a Sierra cup at his feet, and a Campingaz Bleuet stove resting on a boulder. Literary Hub, 29 June 2026 See All Example Sentences for boulder

Word History

Etymology

short for boulder stone, from Middle English bulder ston, partial translation of a word of Scandinavian origin; akin to Swedish dialect bullersten large stone in a stream, from buller noise + sten stone

First Known Use

1607, in the meaning defined above

Time Traveler
The first known use of boulder was in 1607

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Cite this Entry

“Boulder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boulder. Accessed 7 Jul. 2026.

Kids Definition

boulder

noun
boul·​der ˈbōl-dər How to pronounce boulder (audio)
: a large detached and rounded or worn mass of rock

Geographical Definition

Boulder

geographical name

Boul·​der ˈbōl-dər How to pronounce Boulder (audio)
city northwest of Denver in north central Colorado population 97,385

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