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2 definitions found
 for Bowlder
From The Collaborative International Dictionary of English v.0.48 :

  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
     Bowlder wall, a wall constructed of large stones or
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a large smooth mass of rock detached from its place of
           origin [syn: boulder, bowlder]

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