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burstone

[bur-stohn] /ˈbɜrˌstoʊn/
noun
1.
any of various siliceous rocks used for millstones.
2.
a millstone of such material.
Also called buhr, burr.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for burstone

buhrstone

/ˈbɜːˌstəʊn/
noun
1.
a hard tough rock containing silica, fossils, and cavities, formerly used as a grindstone
2.
a grindstone or millstone made of this rock
Word Origin
C18 burr, perhaps identical to burr1 (alluding to roughness)

burstone

/ˈbɜːˌstəʊn/
noun
1.
a variant spelling of buhrstone
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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10
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