bur-stone

burstone

[bur-stohn]
noun
1.
any of various siliceous rocks used for millstones.
2.
a millstone of such material.
Also called buhr, burr.


Origin:
bur(r)4 + stone

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World English Dictionary
burstone (ˈbɜːˌstəʊn)
 
n
a variant spelling of buhrstone

Collins English Dictionary - Complete & Unabridged 10th Edition
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