boulder

noun

boul·​der ˈbōl-dər How to pronounce boulder (audio)
variants or less commonly
: 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.
The complaint alleges the blaze ignited when the two workers from the Public Works Department were moving boulders in Trabuco Canyon. Claire Wang, Oc Register, 14 Jan. 2026 There were several large boulders scattered along the highway. Jennifer McRae, CBS News, 12 Jan. 2026 Video from the location Monday morning showed children playing among the giant boulders. City News Service, Daily News, 12 Jan. 2026 With a contemporary lodge design by architecture firm Olson Kundig, Larch House comprises 10 buildings around a central courtyard, where a boulder garden and firepits invite guests to gather. Asa Canty, Travel + Leisure, 8 Jan. 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 14 Jan. 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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