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

Here’s how: The value of the Higgs field that pervades all of space would have to increase—something physicists liken to rolling a boulder up a hill. —Jeanna Bryner, Scientific American, 20 May 2025

On Thursday, his approach shot went way left — nestling in a little patch of grass between the stream and a boulder. —Jordan Kaye, Charlotte Observer, 17 May 2025

Among the sites where Frazier would like to nail one up: the childhood homes of John F. Kennedy and Sonia Sotomayor; the playground where hip-hop found its form; a glacial-erratic boulder that barely escaped Robert Moses’s bulldozers; the scene of a murder that led to a 10-year gang truce. —The Atlantic, 15 May 2025

Photos shared with the Facebook post show her sitting, standing and even napping from atop a boulder. —Sara Schilling, Sacbee.com, 15 May 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