There are 2 definitions of boulder in English:

boulder1

Syllabification: boul·der
Pronunciation: /ˈbōldər
 
/

noun

A large rock, typically one that has been worn smooth by erosion.
More example sentences
  • The organisation said the most numerous relics were rock carvings found on boulders and outcrops.
  • The trail narrowed, weaving round giant boulders and overhangs of smooth rock.
  • The reverie was broken as if someone hurled a boulder into a smooth flowing stream.
Synonyms

Origin

late Middle English: shortened from earlier boulderstone, of Scandinavian origin.

Derivatives

bouldery

adjective
More example sentences
  • A bouldery summit with a large cairn looms large, fooling many into believing this is the summit.
  • The Spey snakes between rolling hills, with stretches of bouldery rapids and limpid pools where salmon leap and plop.
  • Flanagan lowered his close-shaved, bouldery head, studied me with unwavering eyes, then took a swallow from his pint.

Definition of boulder in:

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Word of the day antebellum
Pronunciation: ˌantēˈbeləm
adjective
occurring or existing before a particular war…

There are 2 definitions of boulder in English:

Boulder2

Syllabification: Boul·der
Pronunciation: /ˈbōldər
 
/
A city in north central Colorado, northwest of Denver, home to the University of Colorado; population 94,171 (est. 2008).