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boulder

[bohl-der] /ˈboʊl dər/
noun
1.
a detached and rounded or worn rock, especially a large one.
Also, bowlder.
Origin
dialectal Swedish
1610-1620
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
Related forms
bouldered, adjective
bouldery, adjective
Can be confused
bolder, boulder.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for bouldery

boulder

/ˈbəʊldə/
noun
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
Derived Forms
bouldery, adjective
Word Origin
C13: probably of Scandinavian origin; compare Swedish dialect bullersten, from Old Swedish bulder rumbling + stenstone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for bouldery

boulder

n.

1670s, variant of Middle English bulder (c.1300), from a Scandinavian source akin to Swedish dialectal bullersten "noisy stone" (large stone in a stream, causing water to roar around it), from bullra "to roar" + sten "stone." Or the first element might be from *buller- "round object," from Proto-Germanic *bul-, from PIE *bhel- (2) "to inflate, swell" (see bole).

Online Etymology Dictionary, © 2010 Douglas Harper
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