Also, bowlder.

1610–20; short for boulder stone; Middle English bulderston < Scandinavian; compare dialectal Swedish bullersten big stone (in a stream), equivalent to buller rumbling noise (< Old Swedish bulder) + sten stone

bouldered, adjective
bouldery, adjective

1. bolder, boulder ; 2. boulder, cobblestone, granule, pebble, rock, stone. Unabridged


a city in N Colorado. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boulder (ˈbəʊldə)
1.  a smooth rounded mass of rock that has a diameter greater than 25cm and that has been shaped by erosion and transported by ice or water from its original position
2.  geology a rock fragment with a diameter greater than 256 mm and thus bigger than a cobble
[C13: probably of Scandinavian origin; compare Swedish dialect bullersten, from Old Swedish bulder rumbling + stenstone]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1670s, variant of M.E. bulder (c.1300), from a Scandinavian source akin to Swed. dial. bullersten "noisy stone" (large stone in a stream, causing water to roar around it), from bullra "to roar" + sten "stone." Or the first element may be from *buller- "round object," from P.Gmc. *bul-, from PIE *bhel-
(2) "to inflate, swell" (see bole).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Crowds of boulders have been perched on the sides of the hills and dropped over
  the plains.
There are lots of tall pine trees and humongous, light beige boulders lie
  scattered about everywhere.
Glaciers slowly grind their way over mountains and plains, moving immense
  boulders and carving out fjords.
Go to any rapidly flowing mountain stream and observe the size of the much
  smaller boulders that do not move.
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