GNU Collaborative International Dictionary of English

Found one definition

      
{ Bowlder, Boulder , } n. [Cf. Sw. bullra to roar, rattle, Dan. buldre, dial. Sw. bullersteen larger kind of pebbles; perh. akin to E. bellow.]
1913 Webster
A large stone, worn smooth or rounded by the action of water; a large pebble.
1913 Webster
(Geol.) A mass of any rock, whether rounded or not, that has been transported by natural agencies from its native bed. See Drift.
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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.
1913 Webster

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