Definify.com
Webster 1913 Edition
Boulder
Boul′der
(bōl′dẽr)
, Noun.
Same as
Bowlder
. {
Bowl′der
,Boul′der
, }Noun.
[Cf. Sw.
bullra
to roar, rattle, Dan. buldre
, dial. Sw. bullersteen
larger kind of pebbles; perh. akin to E. bellow
.] 1.
A large stone, worn smooth or rounded by the action of water; a large pebble.
2.
(Geol.)
A mass of any rock, whether rounded or not, that has been transported by natural agencies from its native bed. See
Drift
. Bowlder clay
, the unstratified clay deposit of the Glacial or Drift epoch, often containing large numbers of bowlders.
– Bowlder wall
, a wall constructed of large stones or bowlders.