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buhrstoneBUHR'STONE, n. A subspecies of silex or quartz, occurring in amorphous masses, partly compact, but containing many irregular cavities. It is used for mill-stones. This word is often written burr-stone. |
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buhrstoneBUHR'STONE, n. A subspecies of silex or quartz, occurring in amorphous masses, partly compact, but containing many irregular cavities. It is used for mill-stones. This word is often written burr-stone. |