burstone

[bur-stohn]

noun

any of various siliceous rocks used for millstones.

a millstone of such material.

Also, buhrstone, burrstone.

Also called buhr, burr.

Origin:
bur(r)⁴ + stone

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Burstone is always a great word to know.

So is callithumpian. Does it mean:

a gadget; dingus; thingumbob.

a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

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Collins

World English Dictionary

buhrstone, burstone or burrstone (ˈbɜːˌstəʊn)

—n
1.	a hard tough rock containing silica, fossils, and cavities, formerly used as a grindstone
2.	a grindstone or millstone made of this rock

[C18 burr, perhaps identical to burr¹ (alluding to roughness)]

burstone, burstone or burrstone

—n

[C18 burr, perhaps identical to burr¹ (alluding to roughness)]

burrstone, burstone or burrstone

—n

[C18 burr, perhaps identical to burr¹ (alluding to roughness)]

burstone (ˈbɜːˌstəʊn)

—n
	a variant spelling of buhrstone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Related Words

buhr burr

burr

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burstone

bur·stone