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.
The piazza will jut out over the great stone boulders that will form the rip-rap bay wall. Miami Herald Archives, Miami Herald, 27 Mar. 2026 Expect boulders wedged between undulating 200-foot-high red sandstone walls, loose sand, and tricky obstacles to maneuver. Madison Chapman, Outside, 25 Mar. 2026 By the following morning, the boulder had been moved. Fedor Zarkhin, Los Angeles Times, 25 Mar. 2026 On our hike, Jessie Krebs scolds her boots for sliding on a slick, house-size boulder. Andrew McKean, Outdoor Life, 19 Mar. 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

Browse Nearby Words

Cite this Entry

“Boulder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boulder. Accessed 30 Mar. 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

More from Merriam-Webster on boulder

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster