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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Bowlder \Bowl"der\, Boulder \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.
From WordNet (r) 2.0 [wn]:
bowlder
noun: a large smooth mass of rock detached from its place of origin [syn: {boulder}]
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