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| buhr·stone [ búr stn ] (plural buhr·stones) or bur·stone [ búr stn ] (plural bur·stones) or burr·stone [ búr stn ] (plural burr·stones) |
noun |
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| Definition: |
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1. rough hard rock: a rough hard quartz rock. Use: formerly, millstones, grindstones.
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2. stone for milling or grinding: a millstone or grindstone made from buhrstone
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| [Mid-17th century. < variant of burr1 (because of the stone's roughness)] |
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