boulder

1 of 2

noun (1)

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

bowlder

2 of 2

noun (2)

bowl·​der

less common spelling of boulder

: a detached and rounded or much-worn mass of rock

Examples of boulder in a Sentence

Recent Examples on the Web
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Noun
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

Noun (1)

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

Noun (1)

1607, in the meaning defined above

Time Traveler
The first known use of boulder was in 1607

Browse Nearby Words

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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