Large fragment of rock that has a diameter greater than 256 millimeters (200 millimeters in the United Kingdom).

1670s, variant of Middle English bulder (c. 1300), from a Scandinavian source akin to Swedish dialectal bullersten "noisy stone" (large stone in a stream, causing water to roar around it), f [..]

large rock.

a very large rock or stone

a size-classification of rock pieces. Boulders should be lumps of rock at least 200 mm in diameter.

Geological obstacles (mostly single large pieces of rock encountered in sandy or clayey soils).

(n) a large smooth mass of rock detached from its place of origin(n) a town in north central Colorado; Rocky Mountains resort center and university town

A rounded rock on a BEACH, greater than 256 mm in diameter, larger than a cobble. See also GRAVEL, SHINGLE.

Any loose rock (sediment) larger than 256 millimeters (10 inches).

Any loose rock (sediment) larger than 256 millimeters (10 inches). more details...

A rounded rock on a beach, greater than 256 mm in diameter, larger than a cobble. See also gravel, shingle.

A free standing rock, large enough to be distinguished from its surroundings. It is mapped as a black dot. "C" Meet A local event which does not count in the rankings.

large stone, normally isolated, often encircled by stones intentionally piled up against it. BUSTAN

A large mass of stone detached from the surrounding land. (geology) A particle greater than 256 mm in diameter, following the Wentworth scale A large marble, in children's games. * '''2006''', [..]