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buhrstone
[ bur-stohn ]
buhrstone
/ ˈbɜːˌstəʊn /
noun
- a hard tough rock containing silica, fossils, and cavities, formerly used as a grindstone
- a grindstone or millstone made of this rock
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Word History and Origins
Origin of buhrstone1
C18 burr , perhaps identical to burr 1(alluding to roughness)
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