boulder

noun

boul·​der ˈbōl-dər 

variants or less commonly bowlder

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

bouldered

ˈbōl-dərd 

adjective

bouldery

ˈbōl-d(ə-)rē 

adjective

Examples of boulder in a Sentence

Recent Examples on the Web

Similarly, instead of modifying the landscape, McGuire integrated it into the pad’s design—a bridged walkway passes through two massive granite boulders, leading the way to the front door, and the office/guest room features an integrated desk, with a boulder protruding through a wall of glass. —Abby Montanez, Robb Report, 10 Mar. 2025

How do boulders express their autobiographies to geologists? —Ray Mark Rinaldi, The Denver Post, 10 Mar. 2025

Inside the Jardin des Tuileries and in time to Robert Wilson’s choreography, models walked beneath a prehistoric flying bird and enormous boulders descended from the ceiling, over hot lava projected onto the ground, and around icebergs emerging from the floor. —Arden Fanning Andrews, Vogue, 4 Mar. 2025

Huge boulders aren’t exactly in high supply in the grassy plains on which Stonehenge was built. —Hannah Edgar, ARTnews.com, 26 Feb. 2025

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

Rhymes for boulder

• bolder
• bowlder
• colder
• folder
• golder
• holder
• molder
• moulder
• older
• polder
• shoulder
• beholder

Kids Definition

boulder

noun

boul·​der ˈbōl-dər 

: a large detached and rounded or worn mass of rock

Geographical Definition

Boulder

geographical name

Boul·​der ˈbōl-dər 

city northwest of Denver in north central Colorado population 97,385