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.
Debris flows occur when water rapidly flows downhill and picks up not only mud but also rocks, branches, sometimes even massive boulders and cars. Rong-Gong Lin Ii, Los Angeles Times, 13 Feb. 2025 From that two years of work, researchers learned that the surface of the asteroid is covered in rocky boulders. Ars Technica, 30 Jan. 2025 On- and off-road, the two new engines aren't shy about sending sound into the cabin, especially when hanging in gear gripping over boulders, but also when passing slower traffic. Barbara A. Perry, Newsweek, 28 Jan. 2025 Most people picture icebergs like big floating boulders in the ocean. Erik Klemetti, Discover Magazine, 28 Jan. 2025 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 Entries

Cite this Entry

“Boulder.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boulder. Accessed 27 Feb. 2025.

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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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