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 for boulder
The basin area is underlain by the quartz monzonite of the boulder batholith.
Boulder city also houses a small, satellite campus of the college of southern nevada.
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