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

The boulders are already on the site being exposed to weathering, the Martin representatives said. —Andres Viglucci, Miami Herald, 14 Jan. 2025

Deep, steep-sided gorges run along two sides of the promontory, and sometime between 1500 and 1000 BCE, people stacked boulders into a double layer of high, thick walls to block off the end of the plateau from the plains to the west. —Ars Technica, 9 Jan. 2025

These canvas structures—designed to mimic the boulders scattered across the landscape—are luxuriously outfitted with modern comforts like speedy WiFi and Nespresso machines and feature private plunge pools, where elephants frequently stop by for a drink. —Christine Chitnis, Vogue, 8 Jan. 2025

This photo series focuses on the clusters of granite boulders that seem to act as coastal guardians along the Nova Scotia waterfront. —Jeanine Barone, Forbes, 9 Jan. 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

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