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.]
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.
Source: Webster's Revised Unabridged Dictionary (1913)
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