boulder

[bohl-der] /ˈboʊl dər/
noun
1.
a detached and rounded or worn rock, especially a large one.
Also, bowlder.
Origin
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.

Boulder

[bohl-der] /ˈboʊl dər/
noun
1.
a city in N Colorado.
Example Sentences for boulders
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.
Blades produce a random mix of dust and boulders that will make your espresso bitter.
Players can rearrange trees and boulders, reconfigure buildings, or hollow out new caves in hillsides.
The trunk lid and rear bumper and rocket were visible, but the rest of the car was buried under boulders and rubble.
Boulders were banging against each other as the torrent pushed them downstream.
And as he or she struggles uphill, look who's rolling boulders down.
The beach of the cove is heavily strewn with giant boulders.
British Dictionary definitions for boulders
boulder (ˈbəʊldə)
 
n
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]
 
'bouldery
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for boulders
boulder
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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Difficulty index for boulders

Many English speakers likely know this word

Tile value for boulders

11
14
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Quotes with boulders