Bowlder

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Bowlder \Bowl"der\, Boulder \Boul"der\, n. [Cf. Sw. bullra to
     roar, rattle, Dan. buldre, dial. Sw. bullersteen larger kind
     of pebbles; perh. akin to E. bellow.]
     [1913 Webster]
     1. A large stone, worn smooth or rounded by the action of
        water; a large pebble.


        [1913 Webster]
  
     2. (Geol.) A mass of any rock, whether rounded or not, that
        has been transported by natural agencies from its native
        bed. See {Drift}.
        [1913 Webster]
  
     {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]

From WordNet (r) 2.0 [wn]:

  bowlder
       n : a large smooth mass of rock detached from its place of
           origin [syn: {boulder}]