boulder

boul-der · noun

imported

Definitions

noun

  1. 1.

    A large rock, typically one that has been smoothed by erosion.

  2. 2.

    (geology) A rock fragment larger than 256 mm in diameter.

Forms

plural: boulders

Phrases & expressions

  • •
    boulder-strewn — covered with many large rocks

Related words

See also: pebble, rock, stone
Synonyms: rock, stone

Etymology

From Middle English "bulder," probably of Scandinavian origin, related to Swedish dialectal "bullersten" (large stone in a stream that makes noise), from "buller" (noise) + "sten" (stone).